Who plays bobby in X-Men?

There is no character named "Bobby" in the X-Men franchise. Are you perhaps thinking of Iceman, whose real name is Bobby Drake?

If you're thinking of Iceman, he's been played by several actors in the X-Men movies:

* Shawn Ashmore played Iceman in the original X-Men trilogy (X-Men, X2: X-Men United, and X-Men: The Last Stand) and in the prequel film X-Men: First Class.

* Eliot Knight played a young Bobby Drake in the TV series "Legion."

* Evan Peters plays a different version of Bobby Drake in the X-Men: Apocalypse and X-Men: Dark Phoenix films, though he plays a different mutant named Quicksilver in other X-Men movies.

Let me know if you have any other questions about the X-Men!