Are there spoilers?

this isn’t a spoiler, but i don’t think the fact we’re seeing him with different emotions is split personality; we’re just seeing him more often so we get more dimensions to his character! he tends to be kind in front of other people probably to just make sure they like him, but it doesn’t mean he’s all happy sunshine and all!! i hope this cleared some stuff up!! (●'◡'●)ﾉ

Well on the surface he is a fluffy, airhead character because in reality his general personality is the "ya whatever" type and he smiles a lot. This is quite different to what we expect or expected from him but it doesnt mean he has a split personality.