While I don't find Ghirahim attractive (he's a bit too feminine for my tastes) I do like him as a character. I thought he was a lot more interesting & unique than most villains. I'd say I liked him more than Demise personally.
I liked the creepy way he acted in Skyview. The pretending he wouldn't kill you if you helped him in the Fire Sanctuary was great. The #1 spot for His Demonic Fabulousness goes to... the derpy dancing!