They already introduced Korg, Hercules, Zeus, Battlestar and USAgent into the MCU.
There are some Marvel comics characters I would like to see appearing in the MCU.
Beta Ray Bill -- has potential as a character in the comics. Should be interesting in the MCU.
Balder the Brave -- played a pivotal role in Thor lore and should have been included in the first Thor film. I wonder why he hasn't appeared in any of the Thor movies?
Squirrel Girl-- was supposed to appear in a New Warriors TV series but it was cancelled.