>>52312094artist here
1) Iono had the most potential because great design. However, popularity mostly got destroyed by her personalities now that we played the games. I'm sorry but Iono had so much dialogue yet not a single line of it was funny, interesting or memeable. She was just annoying and talking streamer nonsense.
2) Grusha looks to girly for me. I know feminine boys tend to be popular in anime, but Grusha is just too feminine. Lacking a voice there is literally nothing that proves he is a man other than the game saying so.
The same goes for Rika. I like masculine girls but that's just too masculine, I'm sorry. imho they overdid the funny gender swap thing with these two.
3) the rest of the cast is funny but not sexy. Big L for nsfw artists since nobody wants to see nsfw art of Larry or the bug gym leader.