Your friend has good taste to have this furry anthro version of Lupin the Third involved for your cute panda self. While a fox does suit him well, given how crafty and cunning he is, with a name like "Lupin", a wolf would also be just as fitting. Still, he looks great in your style, both funny and endearing.
She only requested he be furry, the idea to make him a Fox and character design is all mine. And yeah, I did think to make him a Wolf, a Weasel or a Cat but my mind just kept going back to Fox and it felt right.