Armien X has the body structure of Four Arms, with Alien X's spikes on his head. His skin is that of Alien X's, being black with white shading, and stars all over his body. He wears Four Arms' clothes. He wears the Omnitrix on his belt.
- Armien X has the enhanced strength abilities of Four Arms.
- Armien X has the omnipotence of Alien X.
- Armien X's size makes him a large target, and makes it difficult for him to hide in small places.
- Armien X, due to having Celestialsapien DNA, has two extra personalities, which prevents him from doing anything without two of the three personalities agreeing. One of the personalities is Four Arms. It is currently unknown if he shares Bellicus and Serena with Alien X.