Innes (Fire Emblem: The Sacred Stones) - This one is SUPER relatable. He's very smart, but not so good with people. He comes across blunt and seems to have a hard time expressing how he feels (particularly with his sister, who he obviously cares about but words things poorly enough that he seems cold and distant to her and others). Innes is also very prideful and competitive, and he seems to be a perfectionist who does not accept failure. All of that is so incredibly relatable to me that Innes is one of those characters that I watch in-game and am just like, "man, I feel you, I totally get you."
Logy Ficsario (Atelier Escha & Logy: Alchemists of the Dusk Sky) - Mmm, I love me some characters who feel crushed under the weight of self-perceived guilt and failure! Logy blames himself for something and in turn ended up believing that it was better to never try things again because they might go wrong... like me. Logy's also another one of those "smart but not much of a people-person" (especially not compared to Escha, the female protag), and he also has some very neat-freak qualities that remind me of myself. I also appreciate his wit and sometimes dry and sarcastic humor, which is pretty me IRL. He also doesn't play along with Katla's VERY annoying shtick even though she's a kid (I hate that character lmao), which I appreciate greatly.
Zane Truesdale/Ryo Marufuji (Yu-Gi-Oh! GX) - Here's a character I always liked a lot, but he became more relatable as time went on. He's got that kind of aloof-but-smart thing going on that I generally relate to anyway, but the things that he goes through in season 2 (that shift from being the top of your school to entering the real world (... by YGO standards lol) and actually having to experience failure that you never did before and realizing that you're not special and that the world is harsh) really speaks to me since I've kinda experienced a similar rise-and-fall from being someone who did fantastic all throughout school, to things grinding to a halt in "the real world" as an adult and being utterly lost. ...I miss school and having clear goals. ;_; to be honest, I don't like the freedom that comes with being an adult at all :/
Kurasame Susaya (Final Fantasy Type-0) - And here is yet another character who seems kinda emotionally distant but really does care about the people close to him (like Class Zero, his cadets that he cares for but of whom nearly all the cadets - but especially Nine and Cater - act like Kurasame is like some huge jerk when he never really does anything to warrant it?? like, at all?? he's strict but fair). In the prequel manga about him, his personality early on also reminds me a lot of myself with the way he was with his classmates, and his personality during the time of Type-0 proper also resonates with me (and him with his Tonberry is like me with my cats). I dunno, Kurasame is a hard one for me to describe why exactly I relate to him a lot so this is a kind of shoddy answer, but I do.