Nobody:

Damien, whispering: Hey you, I know who you are. Hail Demise. (/ref)

No, that's not a heart, it's an upside-down Triforce piece. It's usually used for Lorule's sigil or a follower of Demise/InHylian (their version of a satanist)... in his case, it's always the latter. Basically like an upside-down cross.

I say I'm a Christian... and then I draw s- like this :skull: :sob:
#IDZDamien