[There can't be many redheads here named Marui- as a last or first name. To her it's a unique enough name that she's positive Susato is talking about the same guy, but she'll toss out a few other descriptions just in case.]

Yep! Plays tennis, talks about how much of a genius he is, kinda obnoxious? He's actually a sweet guy underneath all that, though.

[It's clear she doesn't mean that obnoxious thing cruelly, in fact she says it all with a gentle smile and mildly apologetic tone. Because, well, guy's got an ego a mile wide and she knows it. It's usually one of the first things that becomes apparent when he speaks. And, usually, most guys with a huge ego are pretty insufferable. But, sometimes that isn't the case. Alvin's the same way.]