NPCs
NPCs (or Non Playable Characters) are plot-significant characters that do not fall under the category of playable characters or bosses. Most NPCs can be interacted with in-game for dialogue, revealing important (debatable) information. Most of them sell items to assist your runs.
Shopkeepers
Shopkeep
Shopkeep is a character and an NPC in the game. She is responsible for maintaining the Shop.
The Dealer
The Dealer offers blurses which buff and debuff your run.
Beggar
Beggar is the NPC that eats your guns in exchange for money.
Moth
Moth offers max health in exchange for gun upgrades.
Target Girl
The Target lady offers a minigame for 8 coins where you have a change to earn more if you score well enough... or lose money if you suck.
Barista
The Barista sells pastries for 10 coins which increase the player's max health by 1.
Bell
Bell offers a vending machine for 10 coins which dispenses a random gun.
Non-interactable Characters
Non-interactable Characters are NPCs that play a significant role in the story, but are unable to be interacted with in-game and are only mentioned or seen.
Husky
Husky is the daughter of Dr. Valora. At some time before the events of the game, she was lost in the Rabbit Hole.
Dr. Valora
Dr. Valora is a world-renowned researcher and philanthropist who designed the M.O.K.O robot. He is researching the Rabbit Hole in order to find his lost daughter, Husky.
Other
Bluko
Bluko (or M.O.K.O model V2) is an NPC that you can find in Floor 2. You can retrieve the Robot Leg from them in order to complete the M.O.K.O questline.