Hey Lynx!
Garrus: Perfectly okay! He's pretty alienish!
Scar : With his mask on, he's pretty monster-rish. We're a bit iffy on him without it.
Cayde-6: Love the face, it definitely gives the impression of a robot. However, since we're not able to see the rest of his body (from Google Images, we're not familiar with Destiny 2!) we think he's too humanoid for our taste. If you take inspiration from him, make your character more like WALL-E or the robot from the Jetesons! So giving him more robust, robot body, maybe claws for hands or clearly showing his hands are made out of parts and wires, and/or change his legs to be wheels instead. Just some examples!