I've played just about every major R&C game. I adore the series. It's one of my favorites.
My favorite characters would have to be Ratchet, Angela Cross, and Dr. Nefarious.
My top 3 R&C games are- Up Your Arsenal, Tools of Destruction, and A Crack in Time. But in general love them all.
Into the Nexus was a great, albeit short, return for the series, and the movie looks awesome!
I'm not sure what my favorite weapon is... I think any of the whip-based ones are the coolest to me. lol