Hmmm, okay, here’s my idea.

How about we make him more alien looking, making his legs zigzagged, like a Raptor or dog. We’ll the. Trade out the trenchcoat for a black and purple alien harness with a breathing tank and other cool glowey things. The skin will be a deep, dark crimson which will be more glossy. The limbs will also have some alien armour and more dynamic design rather than just a rounded segment.
Next, there would be 6 tentacles, each tipped with a glowing point for either stabbing into the ground, impaling opponants or other stuff. They would be the main mode of transportation, with the lower 4 used for running and scaling walls while the top 2 would have a longer blade for melee combat. The head would be entirely covered with a helmet that would look like a mix between a WW2 Gas Mask and a Predator helmet, with glowing purple energy and green optics (eye bits).

Story: an alien starship emerges from a portal, damaged after barely escaping a cosmic battlefield by making a random portal jump. The lone battleship crashes into our planets surface with this Alien being the last alive. Due to this planets alien atmosphere, he is required to kerp his mask on or die from atmospheric poisoning. Now relying on constantly stealing supplies of Methane and Hydrogen in order to fuel his breathing apparatus, he now (add in your bit here).

So yeah, sounds good?

No