Bullet bills are black missiles usually having small arms and fanged frowns. They are usually fire out of cannons called Bill blasters. Bullet bills are usually enemies or obstacles they attack by either being shot forward or actually following a target. In Mario cart wii and DS You can use Bullet Bills as a weapon by changing into to one and going really fast and knocking everyone else out of the way. In Japan they are known as killers. In some Mario games there is an underwater version of Bullet Bill called Torpedo Ted
- Whether Bullet Bills are alive or not, they produce emotions like any other enemy. They will usually cry when stomped on, and in the cartoons, some talk. Bullet Bills also chase and sacrifice themselves to destroy their enemy, meaning that they are either brave or extremely unintelligent.