(殺す, Korosu) is an Academy Student leveled shinobi of Sunagakure, not currently part of the war due to his low ranking. A member of the Togabito clan, Korosu is devoid of all chakra natures and elemental affinity. As a result of his kekkei genkai, 'Zettai Sesshui', Korosu underwent several bodily mutations at the age of 5, leaving his body heavily disfigured. Though unlike most members of his clan, Korosu was able to 're-develop' his regular human form, allowing him to keep his Togabito lineage secret.
[Absolute Ingestion]: The Togabito, after undertaking their transformation as an infant, are left with a very large 'mouth' of sorts on their abdomen, and multiple teethed lacerations on their various other limbs. The mouth-like crevices allow the Togabito to 'eat' chakra, weapons, etc, ingest them, and exude them once more; or in food terminology -- vomit it back out. This doesn't necessarily mean the Togabito is copying the jutsu, he is just merely reversing the process of it by ingesting it and sending it back at the original user.