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.
Trumpy is a yellow variant. Their music makes its allies invincible. Its name is derived from trumpet (rappa in Japanese).
Tuby (ララチューバ, "Raratuba") is a blue variant. Their music confuses MegaMan. Moving up on the D-pad makes MegaMan move down, etc. Its name is derived from tuba.
Tromby (ララボーン, "Rarabone") is a pink variant. Their music immobilizes MegaMan. Its name is derived from trombone.
MuteAnt (ララミュート, "Raramute") is a grey variant. Their music makes MegaMan blind, similar to the Battle ChipBlinder.
Xylos (ララホルン, "Rarahorn") is an orange variant. Their music recovers HP to its allies. Its name appears to be derived from xylophone, despite it not being a brass instrument. In the Japanese version it is derived from horn.
TrumpyEX (ララパッパＳＰ, "Rarapappa SP") is a green variant. It is a more powerful Trumpy, their music also making its allies invincible.
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.
Fanfare (オウエンカ,Ouenka?) summons a yellow Trumpy. When it plays, MegaMan is invincible to attacks. The Trumpy is still vulnerable, though.
Discord (ディスコード,Disukōdo?) summons a cyan Trumpy that causes enemies to become confused for the duration of its song.
Timpani (ティンパニー,Tinpanī?) summons a pink Trumpy, whose song immobilizes enemies while it plays.
Silence (サイレンス,Sairensu?) A gray Trumpy appears and makes enemies blind. They can still attack though, however their hit rate is decreased.
Dark Sound (ダークサウンド,Dāku Saundo?) is a Dark Chip only found in Mega Man Battle Network 5. When used, it summons a purple Trumpy with 100HP whose music paralyzes all enemies. Other than the health penalty caused by using Dark Chips, a bug occurs that causes MegaMan to instantly teleport to the edge of his side of the field.