It can be safely assumed that Jester’s abilities are some sort of manipulation or influence. Examples are from his own show.

His eyes are glowing as are the Fools.  His motif is the Diamond. Where did we see Diamonds? In a certain missing co-worker’s eyes.

Also get away from that mirror. TicTak did warn you to not trust your eyes, right?

So, has Jester just been manipulating his fellow circus members? All this time? Is it all a lie?

No, not lately. He has before, yes, but he had to make a choice. He did warn them already.

Jester is a “Protective Manipulator”. He will do what he needs to do to protect those he cares for. He has his family to protect and that is difficult in a world that fears and hates them on a wide scale.

He did truly earn the leader title. Neko confirmed that portion.

Jester and Ticket Taker work together to keep the circus running. TicTak calculates numbers. Bobo calculates risks. He grew up calculating risks, making choices, and doing what was necessary to keep going.

Then he once more got put into a position to make a choice. He made one…

“The wise fear, the kind that knows it’s too late to run…”

… but at a cost.

Harley blames him and TicTak.

While he won't admit he had anything to do with it, He made a choice and like the rest of his life, he has to live with that choice.

"Jester used his abilites on Harlequin to influence him a bit years ago. It caused a chain reaction I don't think he saw coming or did and felt he could deal with it later."

--

Ticket Taker (1)

Doctor

Pierrot

Jester (You're here!) (2)

Harlequin

Columbina (1)

(They will be updated as they are completed and posted.)