Four Arms' most prominent ability is his enhanced strength, being able to lift several times his own weight and punch through various resilient materials with ease. Since Four Arms is one of Ben's strongest aliens in the Original Series, he relied on him the most when fighting large and powerful foes. Technically speaking, Four Arms is physically stronger than Methanosians and Vaxasaurians at base size.
Four Arms' strength allows him to use anything heavy as a weapon, from big rocks he can throw several feet away, to metal beams and pillars that can be used as clubs. His great strength even extends to his jaws and bite, allowing him to bite metal and damage it.
The older Four Arms grows, the stronger he becomes. By age 16, Four Arms has become strong to the point where he was able to overpower Looma Red Wind, the princess of Khoros, despite female Tetramands being generally stronger than their male counterparts.
By slamming his fists on the ground, Four Arms can create shock waves and cause pillars of rock to erupt. He can also make strong shock waves by clapping all four of his hands together. Ben learned this ability from Tini.
Four Arms has a high level of enhanced durability due to his tough and thorny skin, being able to casually take missiles from a Mechadroid and a slash to the chest from Malware while barely feeling any pain. In correlation to his durable skin, Four Arms is highly resistant to fire and intense heat,
such as that generated by a Pyronite.
Four Arms can jump several times his own height, at least seven stories up, in a single bound.
Four Arms has enhanced reflexes, as he was able to catch and redirect missiles in a single motion.
Four Arms is immune to extremely cold temperatures, demonstrated when he fought Dr. Animo's yeti on top of a snowy mountain, and when he was able to survive on Mikd'lty. Four Arms is also resistant to radiation, as demonstrated by Manny.
Four Arms is also resistant strong winds.