MUUGEN's is more of a gut feeling, maybe it is spite from the other game lmao. But since Ekko seems interested in leading this wagon, i'm fine being a sheep here.
Fuji's is more of a read. As soon as the game started and Fuji saw Mango's roleplay thing, he latched himself to that with his own RP, making himself buddies with Mango. Then, once i told him i knew about Asmongold stuff, he started trying to pocket me and asking me to join them on their RP trio.
A lot of Fuji's posts also feel like he interacts with people, maybe with a question, but then he kinda just agrees or says okay to it, and then proceeds to buddy them.
Feels like Fuji is trying to get on the good sides of everybody, kinda like the good kid that most people don't expect anything bad from.