From left to right:

• Ogmo (Jumper)
• Névoa (Skytorn)
• Captain Yuri (Out There Somewhere)
• EyeBat (TowerFall Ascension)
• Blue Archer & Pink Archer (TowerFall Ascension)

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Ogmo (Jumper)

Released in 2004, Jumper was one of Maddy Thorson's first games. It is a freeware platformer about helping Ogmo escape an abandoned lab. Ogmo was later featured as an unlockable character in Super Meat Boy (2010).

Névoa (Skytorn)

Skytorn is an upcoming procedurally generated action adventure game. According to the PlayStation Blog, it is being made by Noel Berry "alongside the developers of TowerFall Ascension and Night in the Woods".

Captain Yuri (Out There Somewhere)

A 2012 puzzle platformer from the artists of TowerFall Ascension. You play as astronaut Captain Yuri who is trapped on an alien planet. You solve puzzles using a Teleport Gun.

EyeBat, Blue Archer, Pink Archer (TowerFall Ascension)

TowerFall was Maddy Thorson's first commercial game, released on Ouya in 2013. (Later released on PC & consoles as TowerFall Ascension). It is an archery combat platformer with local multiplayer for up to 4 players.

In Towerfall, the EyeBat is an enemy while the Blue Archer and Pink Archer are playable characters

Credit to NintendoWire for their initial list of character names.