Geordi, and he already did. It was called Reading Rainbow, and there was no difference between the character he played there and Geordi. Including the amount of action he was getting.
Barclay, and he already did, during the last few seasons of Voyager. Cause that show was freakin' USELESS without the Barclay episodes.
Wesley Crusher in a Starfleet Acadamy series, also starring The Traveller from Tau Alpha C.
Wesley, going from place to place solving problems in the shirt he wore during Season One, with The Traveller, and a chimp. Now there's a concept we can't get enough of - a man-child, his alien pedophile, and his monkey.