Multiple answers are welcome, and creatures or other general answers are cool, too.

pocket Bowser

throneofroses, it seems this question was made for you.

And for me...I'd want pocket Discord.

pocket megaman

Definitely a Ram.

Ahhh, all of these would be so cute!

Hmmmm, I think Ruby, she'd be adorable to have as smol :,D

Robin from One Piece. For one I think she'd roll with it rather well (whereas most characters would not be okay with this) and it's always handy to have one of the smartest archaeologists in the world on hand at all times (although... I guess none of her archaeology knowledge would apply to the real world whatsoever..? But she's still super smart).

Oh, nice, those are good, too!

Oh man. A pocket Baymax, I think.

Oh my gosh, that would be amazing

(my first instinct was a pocket Iron Man, but. He might object.)

lol yup. that's tony for you.

Pocket, Baymax, however? Yesplz.

Awwwww!~