In Super Smash Bros.
In SSB, Banzai Bills are gold and can be found as missiles that come from Master Hand when he uses his gun hand move. He fires one set of two Banzai Bills when above 100 HP and three sets if below. Each bullet does 5% damage.
In the stage Princess Peach's Castle, Banzai Bill appears from the sky and starts flying towards the castle. Banzai Bill will then land into the castle. The location where Banzai Bill lands is random. Banzai Bill will then start to flash which indicates that it is about to explode. When Banzai Bill explodes, any character in the blast radius will take heavy damage and extreme knockback. Banzai Bill's explosion usually results in a One-hit KO. However, the last hit can KO opponents at low percentage, if the opponent is being hit by the last hit instead of taking multiple hits. Also, the last hit of the explosion (without taking multiple hits) is avoidable by Di'ing at 0%. Any character who makes contact with Banzai Bill before it explodes will take damage and light knockback.
 Trophy Description
In some versions of Melee, the Banzai Bill trophy is replaced by the Bullet Bill trophy, and where it says "only Banzai Bills can be seen", it says large Bullet Bills can be seen.
Banzai Bill appears in the background of the Melee incarnation of Yoshi's Island, like in Super Smash Bros. Melee.