Yeah. Gaspard Ulliel would be a perfect Gambit. The problem is that he will be too old to play Remy when it is time for MCU X-Men. He is 35 now.
He was my classical pick for Gambit, but I agree, it's too late for him now. Between him and Gemma Chan, we really missed out on perfect Gambits and Psylockes.
Let the flames destroy all but that which is pure and true!