Super Mario Galaxy 2 120 stars reward isn’t a character

This information comes from Craig Harris’ (IGN) Twitter account…

“I can officially confirm that no characters unlock after 120 stars in SMG2. But it’s after 120 stars the game unlocks…[TWITTER OVER LIMIT]”

Well, at least this kills the Sonic in Super Mario Galaxy 2 rumors once and for all. I honestly have no idea what the reward is. However, now I’ll be really motivated to finish the game to find out what the secret is!

Source 1, Source 2