I thought that it would be helpful to provide a list of key characters and who might play them to give an idea of what they might look like. I will update as new characters are introduced. I am also adding a little extra background detail.
Elissa - Gabriella Wilde
Part light elf, part dark elf & part Elemental - Daughter of Princess Isabella (deceased) & Prince Aldebaran
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Lucifer/Regulus - The High King of Elysium - Jared Leto
Half Light elf & half Elemental - Son of King Cosmos (deceased) & Queen Celestia
Elves are really into purity, so both Elissa and Lucifer are highly unusual.
Elves 🧝♀️
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Celestia - Queen of the light elves - Emilia Clarke
She may look young, but she is over 1000 years (or solars) old. Her mother created the Light of Elysium.
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Morpheus - King of the dark elves - aka the Dark King - Ian Somerhalder
Celestia's half brother, they co-preside over the elven court. He wants Elissa to be his queen and tricked her into a blood bond.
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Lord Nero - A dark elf - Jonathan Rhys Meyers
He resides in Castle Corinth and his lands border the Animage kingdom. Held Elissa captive when her identity was unknown and has a twisted obsession with her.
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Prince Aldebaran - A Light elf - Lee Pace (as Thranduil)
Elissa's father
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Darish - A wood elf - Miles McMillan
Elissa's guardian when she first arrived in Elysium and is deeply committed to her (in a platonic way).
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Elemental 💧🌬🔥🌎
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Lady Talia - An air Elemental - Holliday Grainger
Sister of Lord Fintan, an ambitious fire Elemental