If they act more like normal animals, I'd keep Oliver around.
If they act like their cartoon selves, I'm not even sure having them in a pet capacity would feel right.
I'd hang out with Tod, Oliver, and Koda though.
Simba seems like his superiority complex would be annoying, especially since he's a kid.
Same for Marie.
Thumper would be so childish it'd just get annoying, and I do not have the patience for Stitch.