What does the effect
Source: Tibia Fandom (Hearts Effect)
*I bolded creatures
Although it's not a creature, you can generate the same effect by using a Sweetheart Ring , obtained from Valentina during the Valentine's Day Event.
As listed by shawtay in their reference to https://tibia.fandom.com/wiki/Hearts_Effect almost all the creatures using the effect are listed there. The only one i can think of not mentioned is the Bonny Bunny from the Winter Solstice event which uses Hearts Beam ( with the same hearts effect ) that causes not the usual drunkeness or summoning of evil sheep, but rather 0-6 fire damage.
I guess sometime Love Hurts
Yay you can go ahead and downvote me for that one. I deserve it :)
Xenia uses some kind of wave with heart/love effect.
Source: https://www.tibiabosses.com/forum/topic/the-great-boss-hunt/?part=20#postid-2239
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