>>27454765Characters like that are usually background charas with not a lot of screen time or fans for that matter. I think the best shot you have at finding something similar in feel is the girl/monster mentor genre like "The girl from the other side" and similar. (Works even better if you like Ike's fanlore and would like to self-insert as a little girl). There's a really brief appearance of a similar character in Kino no Tabi, there's Aiden from Hello Charlotte that fits really well, also not completely human, and maybe if you reeeeally stretch the definition there's something similar in otome games like Ozmafia and TaishoxAlice (first that came to mind) but you do develop romantic feelings with those.
But it's not the same, at all. I don't think there is anything quite like the experience Ike provides in fiction that I know of.
Honestly, I feel like I just get attached to gentle but distant parental-like figures and it gets twisted from there because of my own experience. Maybe this helps?