Neil Diamond is an American singer-songwriter and musician that appears as a form taken by Krishna in "201".
Background
When Barbra Streisand starts destroying South Park, the Super Best Friends figure out a way to pacify her, by having Krishna take the form of Neil Diamond. When he transforms into Neil Diamond, he gives Barbra the opportunity to sing a duet with her, to which she does, preventing her from damaging South Park further.
Appearance
Neil has hair gray from aging, dark gray eyebrows, and a sparkling dark blue suit with a zipper in the middle as well as black pants.