If you change the perspective a bit, Anakin became good again. After throwing the Emperor to save his son, that’s quite a good deed. Even though he may be 100% Dark side, he still has good in him. So the random guy smiling and creeping us out is Hayden Christensen and the OUT-perspective force ghost in Lucas’ “original idea” (which then was replaced with a peverted force ghost, Good job Lucasfilm.) is Sebastian Shaw.
Now i like 1997 special edition best. Sebastian shaw now is the ghost of anakin to me. (screams YEAH at top of lungs)