A characteristic of the 1st generation Digimon (which isn't as drastic anymore in the subsequent seasons) is that the Digimon of the 1st two evolutionary levels are quite different visually from the 3rd. This is because they were initially designed to evolve in many different directions, and not only one. Before the 1st anime season came out, there weren't single established digivolution lines, but instead each diverged in many directions.

Also, using the "X-Antibody" variant design for HerakleKabuterimon was a deliberate choice.

As for the Digimons' names, as you can probably tell, I'm primarily using the original Japanese naming, and not the English-dub renames (e.g. Tailmon and not Gatomon; Plotmon and not Salamon etc.); however, some of the names have been changed by me, and you can see the reasoning and explanation if you click on the question mark beside the changed names.

I am planning to make a separate blog post, explaining my Digimon name choices in more detail.

As for the evolution choices, both Plesiomon and Vikemon are good Mega evolutions for the Gomamon line. The only reason I chose Plesiomon is because I've decided to use Vikemon in my custom Season 4 line (as an evolution of Korikkakumon), and wanted to avoid repetitions (if possible).

As for the Palmon's Perfect and Mega digivolutions, I was stuck between the Blossomon > Petaldramon; and Toropiamon > Hydramon. At first, I wanted to use Hydramon as the Mega, since I was thinking I would use Petaldramon in one of the Season 4 lines, however, I've decided not to. The main reason I chose Blossomon as the Perfect level digivolution is that it's, unlike Toropiamon, also a classic, widely known Digimon (1st generation); while these other options are much more contemporary ones.

It's a little known fact that Unimon (Umamon) was the original "official" Adult-level evolution of Patamon before the Anime.

Beside these 8 main ones, there is also a 9th digivolution line in the 1st generation, the "virus" line:

There were also Mokumon > PetiMeramon and Choromon > Caprimon lines, making the total of 11 in the 1st generation; however, I've used these two in Season 4, and they were among the main ones, so I've decided not to include them here as well.

Those who are familiar with the 1st generation of Digimon, know that, besides these Digimon, the Agumon > Greymon and the Gabumon > Garurumon lines have additional forms. It seems that the creators of the show favoured these 2 characters.

These include the alternative, AKA Alterous modes/variants/forms of MetalGreymon and WereGarurumon, and also their Mega evolutions BlitzGreymon and CresGarurumon, which appear in the 2020 Digimon Adventure reboot.

They also have the "bond" (kizuna) forms: Agumon - Bond of Bravery (AKA FinalAgumon); and Gabumon - Bond of Friendship (AKA FinalGabumon), which appear in the final movie, Digimon Adventure: Last Evolution Kizuna.

MetalGreymon
(Alterous Mode)

BlitzGreymon

Agumon
(Bond of Bravery)

WereGarurumon
(Alterous Mode)

CresGarurumon

Gabumon
(Bond of Friendship)

In order to include complete and consistent lines for all of the generation 1 Digimon, I have decided to make the same for all 8 lines.

I also had to use some of the Digimon which actually belong to later generations, just to fill in the gaps. These Digimon will be presented in these "more complete" lines, but they won't be counted in this generation, and I will avoid using them in gen 1 lines as much as possible.

The Digimon from future generations will be marked with yellow colour.

I'm planning to create a separate post soon, explaining the "bond" (kizuna), AKA the "final" forms.

Even though these lines seem complete, all of these individual lines can actually canonically diverge quite a bit more.

Each one of these Digimon of the "child" level (level 3), can diverge into at least 3 different "adult" level (level 4) Digimon:

I wanted to make full lines until the final (6th) level, however, the problem I ran into was that there is actually quite a bit more Digimon of "middle" levels (namely 3rd and 4th), and they couldn't fit in such a layout, so I had to think further.

For example, a bunch of these quadrupedal, similar-looking, child-level Digimon from the 1st generation are quite known and recognisable:

Betamon

Elecmon

Gizamon

They appear in the Anime as well, but originally, they appeared in the v-pet games, as alternate, secondary canonical evolutions.

Also, these disgusting, ugly, slimy, crappy Digimon are recognisable from generation 1 as well:

Numemon

Scumon

KaratsukiNumemon

These are so called "failed" digivolutions. If a Digimon trainer fails to fulfil other conditions, their MON becomes one of these "crap-mon". They are also able to digivolve further.

Their digivolutions are actually not so bad, as they can evolve into some pretty strong Digimon, which shows that sometimes a Digimon trainer has to fail in order to achieve something powerful.

And finally, there are also these higher level and quite powerful but tiny, baby-sized Digimon:

Mamemon

Giromon

Tekkamon

These Digimon are "condensed". They are very powerful, but very small. Their size is deceiving. Every 1st generation digivolution line had at least one of these.

If including the secondary evolutions as well, the (attempt at) complete generation 1 lines would be as follows:

(Large part of these digivolutions are canonical, with some alterations made by me)

Legend:

Regular digivolutions are in blue.

Green are the failed digivolutions ("crapmon").

Red are the "mini" perfect forms (the "condensed" digimon).

And yellow are the Digimon from later generations, which I used just to fill in all the gaps (these won't count in the numbering system).

You may notice that when the "crapmon" digivolve, their evolved form looks quite different from the base one. At first glance, it seems like their evolved forms have nothing to do with the base form, however, that's not the case, they all have a logic behind them.

For example, if you look at most of the evolved crapmon, they look like plush-toy suits with a creature inside:

Monzaemon

Etemon

ExTyranomon

The actual official, canonical story behind it is that they are the creatures which crawled inside the plush suits.

Other crapmon include other logical transformations (such as tadpoles becoming frogs, etc.).

Those familiar with the 1st generation are aware that even all these aren't all Digimon appearing in this generation.

Digivolutions can be quite inconsistent (especially early ones), as some evolution lines have a large number of possible evolutionary directions, while other lines, only a few. Also some lines may have gaps in them.

Considering the fact that there is only this limited number of lines, which I've already included (if starting from the "fresh" forms); in order to fill all of the remaining Digimon, and complete all their lines, I've decided to add one more branch to each of these lines, which perfectly filled the number of "child" Digimon present.

I have, however, still tried to stick to canonical digivolutions as much as I could, which I will be indicating and giving sources in the description of each line:

Digimon is unfortunately quite lacking on the plant-type species. That is the reason why I had to resort to using some main and pretty crucial Digimon from other generations, just to fill all the gaps and complete the line, even though they will not be counted in this generation.

Below is the full line with all of its branches (with "crapmon" and "condensed" Digimon omitted, in order to be able to include all "regular" lines within one tree neatly).

I decided to only do this for the Tanemon line, and not the rest of them, to avoid repetition and making the article even longer than it already is, but I needed to include this one, since it's been modified:

Believe it or not, even after all these, we're not done with all of the generation 1 Digimon! We haven't discussed variants yet.

You may have noticed that there are "snow"/"ice" versions of certain aforementined Digimon:

Botamon

Agumon

Gottsumon

YukimiBotamon
(AKA SnowBotamon)

YukiAgumon
(AKA SnowAgumon)

Icemon
(AKA IceGottsumon)

Besides these, there are a few more that we haven't mentioned yet:

Leomon

Goblimon

Ogremon

Panjyamon
(AKA IceLeomon)

SnowGoblimon

Hyougamon
(AKA IceOgremon)

Also, sometimes the ice/snow form is the default one, and the variation is of a different type:

Muchomon

JungleMojyamon

Tsuchidarumon

Penmon

Mojyamon

Yukidarumon

There are also dark (also known as "black", or "virus") variants of Digimon. Some examples include:

Agumon

Greymon

MetalGreymon

WarGreymon

BlackAgumon

BlackGreymon

BlackMetalGreymon

BlackWarGreymon

Gabumon

Garurumon

WereGarurumon

MetalGarurumon

BlackGabumon

BlackGaru...

BlackWereGar...

BlackMetalGar...

Some of them are just single ones which don't constitute entire lines:

Patamon

Tailmon

Birdramon

ToyAgumon

Tsukaimon
(AKA BlackP...)

BlackTailmon

Saberdramon
(AKA BlackB...)

ShadowToyAgumon
(AKA BlackT...)

Most "black" variant Digimon are either black or purple in colour, or a combination of the two, however, there are also those whose dark colouring scheme doesn't fit that pattern:

FlareLizamon

MegaSeadramon

DarkLizamon

WaruSeadramon
(AKA DarkMegaSeadramon)

There is also a special kind of dark Digimon variant, the "chaos" form, which can only occur in Mega level Digimon (level 6); and is only present in a few of them. Some Digimon have both the "black" and the "chaos" form, and their coloration, as well as the abilities differ, even though both can be described as "dark" forms of Digimon:

WarGreymon

MetalSeadramon

Piemon

ChaosWarGreymon

ChaosMetalSeadramon

ChaosPiemon

Comparing the 3 variants of WarGreymon:

WarGreymon

BlackWarGreymon

ChaosWarGreymon

There are also dark variants which don't only change the colour scheme, but more of the appearance as well:

Megadramon

Monzaemon

Tyranomon

Gigadramon

WaruMonzaemon

DarkTyranomon

There are also variants which aren't necessary "dark" or "virus", they are other kinds of recoloured Digimon, which include:

Gabumon

Garurumon

Kunemon

Yanmamon

Psychemon

Gururumon

Dokunemon

SandYanmamon

Hagurumon

Guardromon

Goblimon

Ogremon

Solarmon

GoldGuardromon

GenshiGoblimon

Fugamon

These make for some fun evolution lines:

Some of them also have multiple variants (including just simple recolors but also appearance changes):

Palmon

Vegimon

Alraumon

Zassoumon

RedVegimon

Following are some more variants, which don't constitute particular lines, but are individual.

Child level examples (level 3):

Elecmon

ViElecmon

Crapmon examples:

Numemon

Geremon

Otamamon

RedOtamamon

Adult-level examples (level 4):

Kokatorimon

Shellmon

Tailmon

Akatorimon

MoriShellmon

Mikemon

We also have non-dark Digimon which change appearance (rather than just the coloration):

Betamon

ToyAgumon

Drimogemon

Umamon

ModokiBetamon

ClearAgumon

NiseDrimogemon

ShimaUmamon

Sometimes it happens that a Digimon evolves into its variation (thus, they look the same but they're different levels). Some examples include:

Gottsumon
Child (3rd) level

Icemon
Adult (4th) level

Insekimon
Perfect (5th) level

Leomon
Adult (4th) level

Panjyamon
Perfect (5th) level

Meramon
Adult (4th) level

BlueMeramon
Perfect (5th) level

Monochromon
Adult (4th) level

Vermillimon
Perfect (5th) level

There is also a special kind of evolution, known as "Jogress" ("join" + "progress"), also known as the "DNA evolution", where 2 Digimon merge into a new one. Admittedly, this was mainly in generation 2, as it was one of its main gimmicks, but, generation 1 had a few of its own "Jogresses" as well.

Here is an example of a standard Jogress, even though it's a Digimon from later generations:

Yukidarumon

+

Tsuchidarumon

=

Pandamon

Any number of Digimon are able to merge in order to perform Jogress evolution. Examples from generation 1 include:

Chaos
WarGreymon

+

Chaos
MetalSeadramon

+

ChaosPiemon

+

Chaosdramon

=

NeoCrimsonmon

Since Jogress consists of both joining of Digimon and "progress" (meaning levelling up), by these means Digimon can achieve the extremely rare 7th level (AKA the "Ultra" level).

The following Jogress consists of the most Digimon merged (9 Digimon):

Kabuterimon

+

MetalGreymon

+

Greymon

+

Hippogriffomon

+

Airdramon

Kuwagamon

+

SkullMammon

+

Garurumon

+

Monochromon

=

Chimairamon

And finally, we reach the final generation 1 Digimon, the most powerful one of them all, Omegamon:

WarGreymon

+

MetalGarurumon

=

Omegamon

Omegamon

Read more about Digimon Adventure:

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