We've all had a quiet think about this, and we don't see how being Ragnarok'd would affect his appearance. There's nothing that explicitly requires Norse gods to look any particular way - Lord knows the Greeks and Romans are constantly changing theirs, and even the Egyptians do from time to time. So if you'd like to go the Ragnarok route, Nightlight can keep his appearance.
Meanwhile, if you want him to have a supernatural look later in life, not at the outset, then being an eitr of Mani would work well too-- he could get the strange appearance after he becomes an eitr, and then has to go into sudden hiding.
Unfortunately, Selene is a Titan in PJO, but there's a minor Greek goddess named Achelois that could work! Perhaps Nightlight's father whisked him away to the countryside when he realized he wasn't like other boys, or perhaps it's a bit Hunchback of Notre Dame-esque. I'm sure we can come up with something that will work!
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Meanwhile, if you want him to have a supernatural look later in life, not at the outset, then being an eitr of Mani would work well too-- he could get the strange appearance after he becomes an eitr, and then has to go into sudden hiding.
Unfortunately, Selene is a Titan in PJO, but there's a minor Greek goddess named Achelois that could work! Perhaps Nightlight's father whisked him away to the countryside when he realized he wasn't like other boys, or perhaps it's a bit Hunchback of Notre Dame-esque. I'm sure we can come up with something that will work!
Does that help?