Shy Guy, pipe frame, and slim tires is what I used to 3 star 200cc. Make sure to brake on sharp turns or you'll slam into the wall or fly off. On Big Blue you can skip some of the course by jumping off the track at the right time. Youtube both courses for all the shortcuts.
If you need to beat time trials then go with a medium heavy character, pipe frame or streetle, and cyberslicks. That's the combos with the most records. Again you should youtube the tracks to find all shortcuts.