The idea of Ryo expies has been interesting to me lately (as in there is very silly possibilities for them.) I was wondering if the similarities just…come to you over time, or is there just an official Documentation ™️ of all of them?
Once you know to look for them, they start coming to you, but they've somehow managed to stay as kinda under the surface as anime lore and don't have any kind of wiki that I know of. The closest that there is to a widespread concept of them afaik is the idea of 'Komaedas'/the Komaeda checklist, which is like... similar concept but without the awareness that there is actually a legitimate link here between a lot of the "major" ones
I was actually working on a wiki for them, but I ended up putting it on hiatus because I figured there'd be more interest in a decent translation of gekiman lol (which I have,, also had to put on hiatus because of school, but I'll get back to it soon). It's something I do want to get around to though
The first time I saw any concept of it was from this tweet (which appears to be a repost of a pic from here), but it did give me the idea to try and organize them by lineages, so here's some similar maps I tried to make for Ryos/Akiras/Mikis/Amons with a few friends a while ago. This is the closest to a list that I know of existing, and I know these are definitely still missing a bunch. I don't think I've posted these before? So here I guess, incomplete or not
(Ignore the colour coding; it was kinda an attempt to organize how confirmed of an expy characters are (confirmed influence on character/confirmed influence on series/speculation of varying degrees of insanity) but a lot of it is guesswork since we didn't really go digging through interviews for every creator.)
We also kinda had an attempt running at creating our own checklist based off some ideas from the above linked map, the Komaeda checklist, and this chart, but I honestly haven't looked at it in a few years so I should review it before posting it. Input/criticism on any of this is very welcomed of course
My DMs are also always open if you wanna hang out and talk about any of this. It made me embarrassingly happy to get this ask and I was struggling not to prioritize answering it over like... homework