I just got interrupted from watching the beginning but something I noticed was that when Henry woke Lucy up he didn’t say “it found us” or “he/she found us”. He said “they found us”.
So the darkness is a they, or a force/minion/agent of some group, not just one individual. Interesting……
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC