Board Thread:General Discussion/@comment-26208943-20150224183255/@comment-5636642-20150318032750

Lion has a mane... so yeah... that basically confirms his gender as lionesses lack manes.

It could be possible that it is something Rose simply created with her gem that lived on due to Steven having the Rose Quartz gem. Then again, this would all be speculation until we actually find out. I don't quite particularly agree that Lion is Rose, but I feel there is something deeper than that theory.