I think one example I can think of recently is Ace from Geats.

He was perfect in a lot of ways, but to me it wasn't to a point of being a total Gary Stu like with Lucky and Takeru were. I feel like like with him, he had a very realistic point of view and outlook on a lot of things, a lot of which comes from the fact that he was reincarnated for decades, and even despite that it took time for a lot of the characters to warm up to him, eventually see that point of view, and help with their development as well.

There's a lot of reasons why Geats is my favourite of the Reiwa era so far.