Bob-omb Buddy

Bob-omb Buddies are NPCs that appear in Super Mario 64 and it's remake, Super Mario 64 DS. They appear in most of the courses (except Big Boo's Haunt, Hazy Maze Cave, Lethal Lava Land, Dire, Dire Docks and Tick Tock Clock) to open the cannons on their respective courses.

Behavior
You can talk with them but they won't open any cannons until you defeated Big Bob-omb, if you defeated him, they'll be able to open the locked cannons that appear in their respective courses