These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Chip 'n Dale
Ensemble Darkhorse: Clarice only appeared in one short, but she's fairly popular in the fandom.
Fanon: Michael Demcio gave them the surnames Maplewood and Oakmont, respectively.
In Disney canon their relationship is vague but fans often depict them as twins.