Tough for me to say, I'm still using him with his built-in kit since he's been on the shelf. For a couple ideas I'd look at
this.
He's fairly bulky, so skills that add to that strength is one way to go. If you really love everyone's boy, the Rite of Shadows banner brought in some skills that could aid him that isn't mentioned: Earth Boost (Boey) and Wind Boost (It's Gonna Be Mae) for the A slot, and also Distant Def (Celica) for slot B... None of which I managed to get... *twitches*
Another possibility is to replace his unique weapon with Ruby Sword and double up on the Triangle Adept bonus that he already has learned. Could be overkill, I dunno.