First of all, let me say, I love how you love him!
I’d call him Footies.
Mr. Sassypants
Midnight
Obviously either Mittens or Tezcatlipoca.
I had an Uncle Footsie.
He was kinda weird, tho’
How’s about ‘Cecil’?
I thought this, too on first seeing him. Combined with the talkativeness, I’d say it’s pretty likely.
How about
Edward (scissorhands)
Tommelen (thumbs in Norwegian) – Tommy for short?
Extra toes? Ernest, Hemingway, or Ernest Hemingway.
I had a black cat named Tobermory. He lived to be thirteen. Named for the famous short story.
He looks rather Egyptian to me… Ramesses?
My house panther is Ursala. She came with that name. She has several nicknames, I suggest Gary for your pantherette.
He kinda seems like a Monkey. Long limbs, long tail, jumps & climbs everywhere.
But that’s not super dignified, especially for such a regal young prince.
Thus, may I formally present a tentative name:
MONKEYSHINE !!!
Seems to suit the mischievous little guy.
He’s going to be a big boy once he grows into the ears and paws.
I agree that most cats get to have a number of names, so at least one of this kitty’s names should be Bigfoot.
After I posted, I thought Monkey! I love Monkeyshine for him and all the possible nicknames.
Nice black kitty. Congratulations.
How about Berúth, the male form of this?: Berúthiel - Tolkien Gateway
You can borrow my cat’s name. A friend suggested Smokey and I took off the “s” to make Moki. Cutest name ever, if I may say so myself 
Well, I’m late to the table, but Mephisto, short for Mephistopheles.
Or just Faust.
I thought the definition of Pooka was
(for those who don’t recognize it, from the movie Harvey, one of my all-time favorites.)
There’s also Pookie, Garfield’s teddy bear.
That’s Sasquatch, TYVM. Squatch for short. 
Oh my, he looks like a very intelligent, loving, snuggly bundle of joyful trouble.
I’m going to second Die Capacitrix on name suggestions and add Lil’ Devil, Imp or Scamp