A little while ago I figured out a G1-styled version of Umarak as a member of the Brotherhood of Makuta responsible for the island of Okoto, which is presumably one of the ones in the southeastern peninsula or somewhere; I feel like a G1 version of the island would have ta-, po-, onu-, ga-, ko-, and plantlife matoran, all collectively led by Turaga Ekimu, a Turaga of Iron and maskmaker who wears ornate armour and travels the island on an oversized version of Agil (in this universe a creature similar to Nivawk) and is responsible for a Toa Okoto, named for the 6 elemental creatures from G2 and aesthetically similar to the Mata (for obvious reasons).
If stud.io had the shadow trap pieces, he would of course have one on each shoulder-- if I ever get around to picking up his parts, that’s what I intend to do. The only real detail not visible here is a quiver on his right shoulder made from a zamor sphere holder for his six arrows.
Makuta Umarak spends most of his life away from his ostensible territory, hunting Toa teams for sport: he only ever carries six arrows, one for each member of his target team, and is more reliant on his Makuta powers in combat than many of his brothers. He wears a Kanohi Shelek, the Mask of Silence. Often the only warning a Toa has of their impending downfall is the sudden absence of ambient noise before a protosteel-tipped arrow strikes them in the chest.