Hmmm, even purple can look awesome, dunno what to say, if you use standard red command buttons and if you use red like icons for his abilities or spell effects and whatever go red.
Make everything fit together and you won't need to ask things like this
Color alone can be problem, but with nice spell effects, in RPG some awesome legendary items he can use can give him some same colored effects on his sword, icon colors can be red, ability colors as well etc etc