I've noticed there's a lot of emphasis on aesthetics (don't get me wrong, I love aesthetics!!) which might make people feel more limited in expressing themselves. Part of why I don't identify as alienkin is because of the focus on the alien/space aesthetic which doesn't feel authentic to my identity.
You do not have to follow one aesthetic or make sense to anyone but you! You don’t need to wear neon green or follow the stereotypes in the media of what an alien is ‘supposed’ to look like. Plenty of things on Earth already look alien!
Bugs experience the world very differently from humans. Their compound eyes, many legs, and antennae are very alienlike because they do not resemble humanoid beings. Humans often find them repulsive or unwanted because of this unfamilliarity.
You might be inspired by bugs to express your alterhuman / exolien identity! Here are some ideas I had for expressing this:
Translucent layering like sheer sleeves to mimic wings
Patches at the knee or elbow to mimic exoskeletal joints
Keychains and charms that make noise as you walk like a cicada’s clicking
Arm and leg warmers to mimic the segmented limbs of insects
Butterfly/moth inspired eye makeup
Be your authentic self, labels are there to help you not hinder you <3