Currently I'm using my Robin (M) as:
Grandmaster
Armsthrift , Sol, Limit Breaker, Ignis, and "I should really get rid of this but I'm too lazy to grind exp in postgame" Veteran
Not the most thought-out combination, I know, but it works well enough.
Run in with 8 Move thanks to boots. Let enemies kill themselves.
And if there's a lot of hard enemies (basicly did this only in Rogues and Redeemers 3), I might actually switch to Tiki with Limit Breaker and a Dragonstone+, cause those stats paired up with Robin are just hilariously broken. Though that's just TIki (or any Manateke with max stats) for you.
Probably should switch out Ignis with Astra or something that doesn't compete with Sol's activation. Though I gotta admit, that Vantage/Vengeance combo actually looks pretty sexy, too... Gonna try it out next time I start a new game with male Robin.