Troll Boo is a made up character in Starman3's bloopers. He first appeared in Blooper 40 Part 6 and served as an arch-enemy/rival to Prinplup14. Since then, he has appeared in many videos and shorts for humour. He is voiced by Prinplup14, and has a 4D Counterpart by the name of Rainboo.
This is Troll Boo.
He is a Boo that has a troll face and sings "Trolololol" as his special attack.
He appeared in SM64: CoIF where he was in danger after moving to the Star World during the invincibility frames situation, but was saved by Starman3 and temporarily got stuck in a Wing Cap box.