Octomon

Octomon is a Mollusk Digimon whose name and design are derived from the octopus (Octopus vulgaris). A fiendish hacker, it was discovered from the virus it used to crash a rival's research computer. It has a nasty habit of collecting things; the tips of its tentacles are affixed with claws obtained from a Devidramon's data, and it is clad throughout with Digi-Treasure which it gathered from the bottom of the Net Ocean. Fujitsumon, a kind of tiny Shellfish-type Digimon, cling to the pot it wears on its head. These Fujitsumon develop their senses, and it is thought that they have formed a symbiotic relationship so that if they sense danger they inform Octomon. The character on its gun reads "Ink" (墨 Sumi?).

Digimon Adventure 02
Octomon is the Champion form of the Syakomon.

When Digimon start appearing in the Real World, they digivolve to Octomon to fight a Mojyamon, until Kari Kamiya, Angewomon, Koushiro "Izzy" Izumi, and MegaKabuterimon arrive with Jackie to tell them that Mojyamon isn't evil. One of the Poi Brothers and his Syakomon goes to the India/China Border where his Octomon uses his "Spurting Ink Strike" to write "We Come in Peace" on a cliff wall. Later, they show up during the final battle against MaloMyotismon.

Digimon Adventure V-Tamer 01
Octomon is one of Lord Marine's henchmen.

Role in Ultima
In Ultima, Octomon are Naval units in the Deep Savers Navy of the D-Minion Army. Their primary function is piracy on enemy vessels to raid for treasure and other valuable items.

They are a natural digivolution of Syakomon and will digivolve naturally into PirateOctomon with or without a DNA-digivolution with Hookmon. They can also digivolve through a Dark DNA-Digivolution with Gesomon into the monstrous Dragomon. A Dark DNA-Digivolution with Devimon can also evolve Octomon into MarineDevimon units.

Attacks
 * Spurting Ink (海鳴墨銃 Kaimei Bokujū?, lit. "Ink Gun of the Rumbling Sea"): Shoots a bullet packed with potently toxic ink.
 * Octopus Trap (Fujitsumon)