Slug

Slugs are summons in the Naruto universe. Although Katsuyu is the only slug to appear in the actual series, many other, smaller slugs can be seen in conception artwork and fanart relating to Tsunade, Sakura, and the Sannin.

Slugs' offensive abilities seem to revolve around acids and shooting acid from their mouthes, similar to the way toads use oils. Slugs have also been shown to be able to divide themselves into many smaller replicas, though this ability may be unique to Katsuyu due to her size and matriarch level of authority. Slugs may also be able to absorb chakra and even control it to some extent, as shown when Tsunade gave Katsuyu her healing chakra to heal the citizens of Konoha when Pain attacked. Katsuyu, the only slug with any relavence to the story thus far, is often refered to as the "Slug Queen", implying that their are more, lower-ranking slugs similar to Gamakichi and the snakes summoned by Sasuke and Orochimaru from their sleeves. Another implication of this is that Chiyo once refered to Tsunade as "Slug Girl", meaning that when she met Tsunade, she was mostly likely still young, and as such couldn't summon Katsuya yet.

Slug Abilities

 * Tongue Tooth Sticky Acid
 * Chakra utilizing ability
 * Slug Great Division