Pickle Rick

Look Morty, I turned myself into a pickle, Morty.

(true polymorph only works with the form of a sentient pickle)

Your name is now  Rick

Pickle Affinity

Where ever you may be, you can always find the nearest pickle, and you may ask pickles one question a day. the pickle will give you a sarcastic but extremely helpful answer.

Rat Anatomy Tinkering

You are proficiently able to construct a prosthetic rat body large enough to fit a pickle inside of. 

Patron From Another Dimension

Your patron came through a green portal and stuck some strange object with a vile full of red liquid to your head, all of a sudden you were filled with knowledge of sciences along with your arcane abilities, but before you knew it, he was gone.

Morty Clone Companion

Your patron returned to check on you, but left again. When your patron left the second time, he left a clone of his own companion with you (dressed in a low quality ren-faire costume), he constantly doubts that you should be doing the things you do on your adventures saying "uuuuh i dunno rick" or "This doesn't seem safe rick"