But, but, I would never take on a sidekick.
Anyhow, if my Badger character were to take on a sidekick, it'd probably be more of someone who fills in his weaknesses. Given him being anti-social, might be someone able to deal with the public in some capacity (he isn't going to stick around for interviews after all). Don't know how the dynamic would be, "mentor" probably doesn't describe him, has the knowledge but not the temperament.
On the other hand, I could see him ending up with some bubbly teenage sidekick, because that would drive him nuts.