Clara

Clara is an ancient powerful witch and the second most powerful being in the universe presumably only topped by Haruhi Suzu (god herself).

She's also Eosora's sister.

Origin
Very little is know about Clara, Rick mentioned that while she was young her family was killed by someone with superpowers.

She appears to be an old time friend of Rick Moleman and owes him several favors She currently is a member of the ESS Avenger crew.

Her powers include awareness of multiple future outcomes, shes always bored cause to her the future has already been decided.