*shrug* I really like Kagami, but part of it is him just being very non-stoic and emoting. Also, he's more competent than the actual ZECTroopers, although that's not saying much... Plus, once he starts being a Rider regularly and his character development kicks in, he's pretty awesome.

I also can't say much about Bolin as I quit watching Korra right after they did a shipping-focused episode before actually establishing the characters in any meaningful way for the most part. Ziggy's my favorite character in RPM except for maybe Dr. K.