Lore:
Morea was a former Brotherhood member, he left it when he learns about its corruption. He drops his Makuta title as it only goes with darkness and malicious intents so he decided to disassociate himself from the rest of them.
Appearance:
He wears the Kanohi Felnas (Unmutated V2, modeled by Galva), a weapon that composes of a Crystal Spike and the tip of the Staff of Absorption. He has the Purple, Gold, and Black color scheme. Due to his eye colors, it makes him stand out compares to the others.
Abilities and Traits:
He still retains his inner Light unlike the rest of the Makuta because he has shunned out his inner darkness to let his inner light grow. He would have Shadow Hand ability like the other Makuta but he deems it to be immoral to be used.
He can grow and absorb the wings when he needs them.
This is a great imagining of a benevolent Makuta, that still retains the Makuta aesthetic.
Perhaps Morea can use a Light Hand that works opposite to the Shadow Hand? Light Hand would heal the target at cost of a part of the user’s power, unlike Shadow Hand which strengthens the user by absorbing target. He still also could use Shadow Hand, but chooses to not do so for reason you mentioned.