Monster Banner

Monster Banners are vanity items that are dropped randomly by various mobs, similarly to Bosses and their corresponding Trophies. Almost every mob in the game drops a banner. Each banner corresponds to the mob it was dropped from, although not every variety of a mob drops its own unique banner. Each banner has a 0.5% chance to drop from its corresponding monster. There are currently 87 different Monster Banners.

The List
(When adding to this, please keep this in alphabetical order.)

Overworld

 * (raining, hardmode)
 * (bloodmoon, hardmode)
 * (bloodmoon)
 * (bloodmoon)
 * (raining)
 * (solar eclipse)
 * (goblin invasion)
 * (goblin invasion)
 * (goblin invasion)
 * (goblin invasion)
 * (meteorite)
 * (pirate invasion)
 * (pirate invasion)
 * (raining)
 * (solar eclipse)
 * (solar eclipse)
 * (raining)
 * (solar eclipse)
 * (full moon night, hardmode)
 * (hardmode)
 * (solar eclipse)
 * (raining)
 * (solar eclipse)
 * (full moon night, hardmode)
 * (hardmode)
 * (hardmode)

Corruption

 * (underground, hardmode)
 * (hardmode)
 * (hardmode)

Crimson

 * (hardmode)
 * (hardmode, underground)
 * (underground, hardmode)
 * (hardmode)
 * (hardmode, underground)
 * (underground, hardmode)
 * (hardmode)
 * (hardmode)

Desert

 * (day)
 * (hardmode)
 * (day)

Hallow

 * (underground)
 * (underground)
 * (night)

Jungle

 * (hardmode)
 * (hardmode)
 * (lihzahrd temple)
 * (underground)
 * (underground, hardmode)
 * (lihzahrd temple)
 * (underground, hardmode)
 * (hardmode)
 * (hardmode)

Mushroom

 * (hardmode)
 * (surface, night)
 * (hardmode)
 * (surface, night)
 * (surface, night)

Sky

 * (hardmode)
 * (hardmode)

Snow

 * (hardmode)
 * (underground, hardmode)
 * (underground)
 * (hardmode)
 * (night)

Underground

 * (hardmode)
 * (hardmode)
 * (spider cave, hardmode)
 * (hardmode)
 * (hardmode)
 * (spider cave)
 * (hardmode)
 * (spider cave)
 * (hardmode)
 * (spider cave)
 * (hardmode)