They are going to be quite the pair of roommates omg. Roji is definitely those things, and to add more contrast between the two of them to the mix, he tends to reach a somewhat overbearing level of expressiveness which leads him to overreact sometimes. Combine that with him being very much a people person and enthusiastic about making friends, and well...thank goodness Sakichi seems like very much the type to let him know to dial it back like five notches. That said, I think they should still get along! There'd just be a period of them adjusting to each other's personalities! Since it'll have only been a few months, maybe that's what they could be in the middle of working through?

Omfg... Just from what you've said about Sakichi so far, I'm laughing at the idea of him getting introduced to the things that Roji is into. Here's an example of an anime he got hooked on in canon, hahaha. He has a taste for cute stuff, I'm so sorry about him in advance... It'd really mean a lot to him if Sakichi did humor him and join in on anime/game time even if he doesn't necessarily Get It at first, though! He will introduce him to all the nerdy things...