The Jester

Overall view
The Jester is one of the longest lasting currently alive Villains in Vinnysworld/The Boys, originating through multiple different incarnations and names. His current design is similar to the Super Paper Mario villain, Dimentio, with a more green color scheme and visible hair.

Lore
The Jester originates from back in Devonbound, in which he was a Devon that gained the trust of Hacos after Overseer's failure at helping Hacos regain his true form. However his partnership with Hacos was by force, because of Hacos welding his remains onto The Green King's face.

After The Green King had failed he and Hacos were still forced together, and this would turn out for the better with his decisions in the future, becoming the brute of The Purple Foundation and Ancient Vincent's group.

However after a accident involving a rift blast, He and Hacos were separated, and reverting The King to his previous Devonbound form. He'd later then join Hacos' group, "The Children of Hacos.", in which he'd go under another change in form, resulting in his new form, The Jester.

After Vinny and Co. had gained all the Trinity Shards by combining Hacos' nearly finished Trinity with the single shard they had, The Jester swooped in, double crossing Hacos and fusing with the Trinity and X-Jim, resulting in becoming a massive beast known as "The Green Parade."

after these events, The Jester hasn't been seen since, however he's still out there.

Trivia

 * Jester's source of "power" is unknown, it could be a after effect of fusing with the trinity of from that bit of Hacos that was stuck on his face.
 * He is one of the longest living villains in VinnysWorld
 * His reasoning for using X-Jim as a "Ingredient" for the Green Parade could be because of Hacos giving him an Ancient Ability, that being the Lightning element.