First off, thank you! I really appreciate and am so glad to hear that. Ichiru was never really that "cutesy little kid" type at all, but rather more along the lines of being bratty, which is actually something else I've been rocky with. It's my first time ever playing such a young character, though, in general, so I'm glad to hear I've been doing something right.
Healing him (whether part way, or completely) is an idea I've been mulling over, actually. The prospect of getting better is something that is completely out of reach, canonly, so much so that it is very deeply ingrained into his thought process, most specifically with the fact that regular human medicine does absolutely nothing. So, that's been a part of why he's been the way he is, in Kiseki: that even though he's aware of this world very potentially having something that could (even likely) heal him, breaking away from years of feeling so defeated is a challenge. — That said, however, later in canon, he actually is freed from all illness and being weak, and it's via the blood of a pureblood (which is the type of vampire Yuuki is). Heather and Sari and I have talked about taking this route a few times, too. I've stated that, although I'm still sitting on that specific way about things, I've been in game since around April, and feel I'm ready to begin exploring healing him via Kiseki, first. I don't think I'll cure him immediately 100%, but taking steps towards it. As mentioned, being weak, and just knowing he has little potential, is a huge part of his character, so a part of this is just me being unsure how I should go about shifting around how he will carry himself, as well as present himself towards others.
But yes. Long story short, I definitely do want to do something. Not sure on specifics just yet, but I'd love to see him stronger, and more able to stand on his own, rather than always ending up relying on Zero so much (or any of the others who have helped him). — Swimming, can come in, too, absolutely bc I always need more swimmer CR. Simple as it sounds, I also want him to get out and having fun on his bike, too- and just, you know, having fun like a kid his age should (hell, even consistent school attendance is something he's always had trouble with, so that will happen, too).
Anyway, thank you so much for commenting. I really appreciate getting opinions, from an angle that I may have looked over too easily. Though nervous to see how his character may shift around (especially as it is more or less only seen in one chapter, of all 93 in the series, if that), I also look forward to seeing how he can go from there.