Nelson is friendly, pleasant, honest, caring, and thoughtful. He can also be somewhat timid and shy.
In "What's Black and White and Depressed All Over?", Nelson is nervous about meeting other women as he had never seen other women because he was isolated before being brought into captivity by Siegfried and Roy. Therefore, his first crush is Kate, despite the fact that she is a lion and is married to Larry. However, Nelson only likes her because she is the first woman that has been nice to him (to which Nelson mentions that his mother was nice to him, only for Larry to tell him that mothers do not really count). In the end, Larry helps Nelson realize his true love is Foo-Lin.
Nelson is a giant panda. He has blue eyes.
- His slave name is Bong Bong, as revealed in "What's Black and White and Depressed All Over?".