Benry (Slime Demon)

Dealmaker.  Benry can create Infernal Contracts as he pleases so long as the deal is within his power.

Innate Spellcasting. Benry's spellcasting ability is Charisma (spell save DC 10, +2 to hit with spell attacks). The demon can innately cast the following spells at will, requiring no material components: plane shift, teleport, invisible, and Summon Big Bro.

Little Man Goes Where He Pleases. As a bonus action, Benry may return to any location he has preciously been before, no matter the distance. 

Magic Isnt Real Dumbass. Benry has advantage on saving throws against spells and other magical effects

Shifting Anatomy. Benry's body can become coated in a slick sheen or sticky coating at will. Benry can stick to or slide on any surface as he pleases and any creature attempting to grapple him rolls with disadvantage should he choose.

Tiny Little Claws. Benry's attempted "attacks" are considered magical

Scramble. Benry attaches himself to anything he dictates as a surface and climbs it. 

Slappa You. Benry baps his little hands against a target and deals 1d4 psychic damage. 

Summon Big Bro. Benry summons his older brother, who is another Slime Demon with all the same properties as Benry except for a tripled health pool and is a size Huge

Heehoo. Benry teleports to an unoccupied space within the same plane.