"Colossal Revival!" for Colossal Fighter's reviving effect, and his attack is, "Raging Colossus", lol.
I even gave Formula Synchron an attack name. "Formulating Speedway!", with his lol draw effect, "Lol Draw Synchron Activate!" with Synchro effect, " Rose Nuke of Trolling!", since Black Rose Dragon would be my card to Synchro with this most of the time during the opponent's turn for the lulz.
And finally, and Iron Chain Monsters' attacks with "Chain Chain Chain!" but saying it fast, since its funny to repeat the same word sometimes in a fast pace.
Other monsters would just give a generic "'insert part of monster name' Punch!", "Beam", "Chomp", "Crush", "Dive", "Flare", "Smash", "Psychic Punch (or Beam, or Slash)", or "Slash", and in some cases, "Stream". I'm still trying to come up with more since I only got a few.
Pro sig is pro.