Trumpy

Trumpy, known as Rarapappa (ララパッパ) in the Japanese version, is a virus in the Mega Man Battle Network series that resemble a brass instrument wearing headphones. They appear in later games from the series starting with Mega Man Battle Network 3.

A Trumpy jumps up and down in the right-most column on the enemy's side, pausing after four jumps to play music that will affect either MegaMan or its allies. However, Trumpies don't benefit from their own music.

Battle Chips
Trumpies yield Fanfare Battle Chips when deleted. These chips summons a 100HP Trumpy virus (60HP in BN6) in front of MegaMan that causes different effects while playing. The Trumpy can be destroyed by enemy attacks. Like other chips that summon something, these can be placed on the enemies side too.