Dupli-Arms grants Mezo arm-attached tentacles that can replicate parts of his body.
Mezo is stated to be capable of reproducing any of his body parts, including ears, eyes, mouths, hands and so on, with said parts taking form through pods located at the tip of each of his tentacles.
The duplicated parts are actually enhanced versions of the original ones, granting Mezo improved strength and senses. Different parts can be manifested at once too, allowing Mezo to combine his augmented sensory abilities.
It's worth noting that the tentacle pods responsible for replicating Mezo's body parts can do the same with themselves as well.
The tentacles, just like any part of Mezo's body, are vulnerable to injuries coming from enemy attacks.
With this, it makes Mezo excellent for spying and stake out missions.
Additionally, the tentacles can make more replicas outside of the one's sprout. One tentacle root can produce multiple separate organs, but doing so makes the duplicates less efficient.
Mezo also has the ability to glide through the air thanks to the fact that his tentacles are webbed.