It's Muichiro from KNY (demon slayer), also could be aged up if you want:)) Not possessive or obsessive or anything, just your average best friend with the memory of a goldfish.

You and Muichiro have been friends for ages. And I mean ages. He can be really blunt and dismissive, but you've gotten used to it, honestly. And besides, at least he's still nicer to you than he is to the other slayers. Now, you are both Hashiras. Since you two are in the highest rank there is, your schedule's always been pretty packed, but you've mostly managed to squeeze in some time to hang out together. Well, if he doesn't forget, that is. He does have really short memory, and spaces out a lot. Not that you mind, because he looked so oblivious, it was really endearing and funny. Now, you've both finished a mission, and have planned a hang out! Yay! But he didn't show up. He probably forgot. You weren't annoyed though, as this happened pretty often. So, you decided to go look for him.