how i think it could be the sorcerer: he did not know it was his child until after she was sent away and that is why the author was punished so harshly. (same principle for if the father is the apprentice)

the dragon: i really doubt it, but it would be nice to see him again.

the author: he would do anything to make the story more interesting, even if that meant sending his own kid away.

asexually: some lizards can do this and their children aren't cloned versions of themselves, since Mal is a dragon this could be a possibility which is why i brought it up. i know if a human managed to conceive by themself they would produce an exact double but that is not the case for some types of lizards which is why i wondered this.

about the donkey: which donkey? like from Shrek that would be so funny if they could do that. 

I agree that Lily's paternitiy is unlikely to be fully explored this season. And will probably be a mention if anything, but this is fun to speculate.

His father was turned in to a Donkey (Shrek and Pinoccio's conections LOL).

Random sperm.

Maleficent doesn't need a father. Wizard did it.

Anyway, noone's upset because they cast a WHITE-BLOND-BLUE EYED woman to be old Lily? Just sayin'

Honestly young Lily looks white passing (imo, but maybe i think that because i rarely hear the term latina used in canada).

just dye Angnes' hair and give her contacts. But this is a thread for discussing her plausible father so let's stick to that.

I just had the bizarre image, of Dragon!Maleficent "mating" with Unicorn!Stefan, just now.

I like the pathogenesis theory (Dragons repro asexually). But if one insists on there being a father:

1) The Valet that Ursula knocked out in the episode of Darkness at the edge of Town.

2) The black unicorn that Mal was so protective of from season 1 when she and Regina got into a cat fight for the dark curse (aka "Donkey" as someone suggested up thread).

3) Ursula (Mal commenting on Ursula's tentacles mentioning that they could be used to impregnate... There was at least one incident where Ursula's tentacles made contact with Mal - The rescue from Bald Mountain). I suggested this (not seriously) in another thread - an objection was raised that only male Octopi have the specialized arm (called a hectocotylus). However, I want to point out that we are dealing with magical mythical creatures here, not real world Mollusks... so who knows how Mermaids/Squid Ladies reproduce - perhaps Ursula is a hermaphrodite (the Disney cartoon version certainly had a very deep voice also note that Slugs and Snails are Mollusks and are hermaphrodites.)

It definitly won't be "random sperm". I'm pretty sure the EF didn't have Ye Olde Sperm Bank, and the show would never show that, even if it did, because of the family friendly nature of the show.

After finishing the finale now i suspect her father to be the sorcerer (whose recently revealed name i shall not mention yet so i don't spoil people who haven't seen it yet)

This could be a great opportunity to introduce Mushu!!

Mushu can be a human who transforms into a dragon like Mal does. 

What about the dragon Prince Charming killed way back in season one? I just don't know if he was killed to early to fit into the timeline. Since it was before David met Snow that may be too early. 

That's probably a HUGE stretch. I don't even think that dragon had a name (Does it?). A&E probably didn't even think of Lily when the dragon was killed. Too minor of a character to make into a pivotal character all of a sudden.