Slug

are the trademark summon of Tsunade, though Katsuyu has been the only slug seen summoned by Tsunade in the series. The other slug seen in the series is the Six-Tailed Slug, its jinchūriki being Utakata.

Slugs' offensive abilities seem to revolve around shooting acid from their mouths, similar to the way toads use oil. 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. 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.

Slug Abilities

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

Trivia

 * The acid-shooting powers are an exaggeration of real-life slugs' ability to regurgitate digestive acids in self-defense.