SCUMM Revisited can not be used for ripping characters, no. At least not from the earlier games (Sam & Max, DOTT etc.) but some costumes (character images) from the later SCUMM games like Full Throttle, The Dig and Curse of Monkey Island can be ripped with SCUMMRev.
You can however use a program called Costume Ripper to rip from the older games. Find Costume Ripper on LucasHacks! (http://scumm.mixnmojo.com