Castlevania
In Castlevania 1, he doesn't really do a whole lot outside of shooting the occasionaly fireball, but the trouble is with the invincible Igor that will bounce around the room
Frankenstein's monster in Castlevania
Some argue that he should be called Frankenstein's Monster due to being Dr. Frankenstein's creation, but he's adopted the name all his own. The big lug isn't even the real problem in this game--his little buddy, Igor, the hunchbacked assistant to Dr. Franksenstein, is the more aggressive party. Frank's job is to just walk back and forth across the room, in no real pattern, while Igor does all of the work; he'll jump high across the room, accurately lunging toward you, while spitting fireballs--he serves well as a distraction to the real target. Remember that Frank's still deadly to bump into.
Castlevania III: Dracula's Curse
In Castlevania 3, he lumbers across the screen, hurling bricks and smashing the wall, causing blocks to rain down.
He doesn't have any help this time, but the big man is more than ready to compensate. He appears twice in this game, depending on which path you take, but you'll only face him once no matter the path. In both instances, he comes marching in from behind, from the screen's left. He walks back and forth about the room, stopping to stomp on the floor, which causes bricks to fall from the ceiling. If they miss, he'll try again by accurately throwing one of his own bricks at you. They give you safe spot on the right side of the battle area that's only useful if you have a weapon like an axe; otherwise, you'll have to stand up to him.