Little People

The  first appearead in the episode "All the Little People." Finn finds a bag of miniature people planted on him by Magic Man. They seem to not speak English but talk in a gibberish language (Wee or wah). All of the characters included in the bag are:
 * Abracadaniel
 * BMO
 * Booko
 * Businessman
 * Choose Goose
 * Cobbler
 * Donny
 * Duke of Nuts
 * Earl of Lemongrab
 * Finn
 * Flame Princess
 * Gary the Mermaid Queen
 * Gnome
 * Goblin Thief #2
 * Gumdrop Lass 1
 * Gunter
 * Horse wearing shower cap
 * Hunson Abadeer
 * Ice King
 * Jake
 * Kim
 * Lady Rainicorn
 * Lemon Camel
 * Lenny
 * Lollipop Girl
 * Lumpy Space Princess
 * Marauders
 * Marceline
 * Mr. Cupcake
 * Mr. Pig
 * Mr. Turtle
 * NEPTR
 * Peanut People
 * Peppermint Butler
 * Phil
 * Princess Bubblegum
 * Ricardio
 * Rock Wall Thief
 * Squirrel (The Duke)
 * Swamp Giant
 * Tiffany
 * Trudy
 * Turtle Princess
 * Witch
 * Wizard Student
 * Xergiok
 * The one on the right side looks like Brad,LSP's former boyfriend, but is white