Jester

A man that has done his best to delete his identity, no one has any idea where he's from or what he wants. He usually presents himself as Chester, but that's obviously not his real name either, he's just laughing at you.

He took over the Conclave during a coup d'état instigated by Lucisfear, and he is now working under his orders as Conclave's leader. He was the main cause of the eldritch incident that Fynn, Lucius, Remilia, Baki, Tsukihi, Merlin, Astora, Adagio and Zero worked to prevent.

Appearance
Hell no, I'm not gonna bother describing that, have you seen the amount of colors he's fucking wearing.

Personality
He believes himself to be most sane and tends to blame the rest of the world for ostracizing him. He is most chaotic and hard to read.

He seems to have gotten crazier after interacting with Lucisfear.

Abilities
His weapon of choice is an unknown number of razor sharp cards with symbols mixed from many different sets, these cards can absorb any element or attack they collide with, including the force of an object.

The cards seem capable of teleporting around the place, appearing in different formations according to Jester's wishes.

He can choose to dissolve his own body into a mass of cards, often reappearing at a seemingly random location.

He's been strengthened by a figment of Lucisfear's power, enhancing his magical aptitude.

Trivia

 * He is the most annoyingly dangerous member of the conclave, mostly because of him teleporting around the place every time you hit him, and considering he seems to ignore wounds, though he's not immortal like Crow.