Sure, why not?
General
Entry: Ah, this might be troublesome.
Tag-In: Let me take over for a bit.
Tag-Out: Do you mind switching? This is getting rather tiresome.
Victory: Ehh, B minus.
Defeat: This is...a joke, right?
Kazuma
Entry: I hope you haven't lost your edge, Kazuma-senpai.
Tag-In: My turn!
Tag-Out: Your turn, "big bro".
Victory: As expected, nicely done!
Defeat: Shit...
Relius
Entry: Let's do this together, Colonel.
Tag-In: I'll take over from here.
Tag-Out: I need backup!
Victory: The NOL sure is somethin', ain't it?
Ragna
Entry: Let's work together, Grim Reaper.
Victory: See, now was that so hard?
Gamma
Entry: Looks like we're fighting together, Lavvy.
Tag-In: Take a break, Ice Age.
Tag-Out: Gimme a hand here!
Victory: "Power of bonds", right? Hahahaha!
Defeat: Tch, we got careless, eh?
Tatsuya
Entry: Come on old man, just this one time okay?
Victory: Not bad, old-timer.
Hans
Entry: Mind working with a subordinate, "boss"?
Tag-Out: Do your job, big guy!
Victory: Maybe you really CAN change the world.
Aincrad
Entry: Ugh, why'd it have to be
you?
Setsuna
Entry: One more fight, for old time's sake, yeah?
Tag-In: You really ARE useless!
Tag-Out: Take over, you damn dog!
Defeat: Damn...useless.
Naho
Entry: Hope you forgive the whole...killing you thing.
Any of the sins
Tag-In: Let me help, you mutt!
Tag-Out: Gimme a hand here, creature.
(edited by hazama)