I'm pretty sure that Mal would get on great with both Sunny and Sam because of their sport connection. He's really into Quodpot, both playing and watching. Same with Michi and Quodpot, even though she's on another team.

With Meka, Apple and Yevy, Mal would like them as long as they are nice and didn't piss him off (a-pry into his family history, b- insult his family or friends or c- explode something in his immediate vicinity. LOL)