They wear a space suit, with either a jet pack, or a copter on top, they have there masks only they have either, a crescent moon on the left side mask, or a sun on the right side, they were there red robes and wear a space suit with an shy guy mask symbol, they have a red raygun that imprisons yoshi's inside eggs, or turns them in to riders, that the guys use as transportation.
The moon Guys are stronger, ther rayguns take your coins/eggs away, as well as both that guy and the crest on the yoshi must be destroyed, they also have a red mask symbol, they use the jetpack and the imprisson eggs must be destroyed with cosmic eggs.
The sun guys, laser beams just take away health, not health/coins/eggs, also only either the shyguy or crest on the yoshi must be destroyed instead of both, they use the copter and there imprisson eggs can be destroyed with anything, they have a white mask symbol.