Bosses/Toothy

Toothy is a boss that can appear in the Caves or Catacombs. He appears as a huge, round bat with two wide horns, a large mouth with a set of short, sharp teeth, and a long, wet, pink tongue.

Attacks
Toothy will fly around the room eradically, occasionally stopping. He is more likely to move if he is taking hits. When defeated, he will fall to the ground and explode violently. He drops an item from the boss pool.
 * If the player is below him, he will shoot a Brimstone laser in front of him. Provides very little reaction time, but is telegraphed by Toothy breathing in.
 * Shoots a burst of shots at the player, like Monstro but with more range. Telegraphed by Toothy closing his eyes tightly and inflating his cheeks.
 * If the player is close to him, he will flail his long tongue around in a circle.
 * Flies to another part of the room with a burst of speed, sometimes close to Isaac.
 * Flies upward off the screen quickly, and then slams on the ground where Isaac was standing at the time, firing blood shots in all 8 directions.
 * At 66% and 33% health, he will screech, summoning several Onetooths around the room.

Champion Versions

 * Red: He will not fire Brimstone lasers or spit blood, but is much quicker and uses his speed bursts more often.
 * Green: Instead of firing volleys of blood, he spits 4 green bomb shots at Isaac which leave green creep. Spawns Gurgles instead of Onetooths.

Trivia

 * Toothy is loosely based off of Pipistrillo from Castle Crashers, whose name means "bat" in Italian.
 * The horns on Toothy's head is a subtle reference to the Bat Winged Demons in Dark Souls.