Mezo's tentacles have the ability to replicate parts of his body such as his mouth, ears, and eyes.
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.