Well, since not many people (and by that, I mean no one, lol) chose which Titan, I'm going to choose the one that's mainly popular in
TitanFall 2 x RWBY fanfics, and that's... (drum roll)

Legion Prime!  I mean, the Prime version isn't really included in most, so I decided: "Why not make it a Prime?"  Also, it's in your F/c, and whenever I put this in: "D/n", it means "Designation name".  Unless,  you want me to come up with one.  For now though, I'll just name him Legion.  But yeah, that's all I wanted to tell you guys.  This is ZEFFEX, signing off!  Later!