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.
The duplicated organs appear to be enhanced versions of the originals, having more acute hearing, stronger gripping strength, etc.
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.