Digimon Season 1-5

Commander-General Homer Yushima

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When people began disappearing, Chief Homer Yushima and Richard Sampson began investigating. They soon learned that the disappearances were the result of a Digital World interference. Along with Dr. Spencer Damon, his assistant Akihiro Kurata, and the Criers, who lost their son Keenan during a Digi-gate experiment. Unfortunately, their trip to the digital world was hazardous and they only found Keenan's basket and toy robot. Worse, Kurata panicked and fired at a Digimon, despite Spencer's warnings not to should hostility. They retreated into a cave, which was inhabited by SaberLeomon, who detested the intruders. In desperation, Kurata used an experimental space oscillation device to create a portal home but Spencer stayed behind to cover their retreat, activating his DNA charge. Spencer managed to contact home, having made friends with Merukimon and looks for King Drasil, the ruler of the Digital World. He told Yushima and Sampson to create the Digimon Data Squad, or DATS for short, to send Digimon who appeared in the Real World back as Digi-eggs, as well as plans for a digivice to help partner Digimon digivolve. Yushima received Kamemon as his partner, who regularly serves tea for the other DATS members.

When the series began, he appeared to Marcus, giving him his Digivice. The old man would appear again, mostly at opportune times, to give Marcus advice pertaining to his latest challenge. The facts about him were later revealed when he journeyed to the Digital World in order to aid Marcus and the others in their first encounter with Merukimon. Yushima was eventually forced to help them escape back to the Human World, and disappeared in a cave-in inside Mercurimon's lair. Gwappamon managed to save him and they barely clinged to life as they escaped from the Infinite Ice Ridge. They heard that Spencer had managed to seek out King Drasil and they decided to retrace his tracks. He later reappeared, captured by the Digimon riding on 
ElDoradimon, until it was revealed that the Digimon saw Marcus's (who was also present) father as their savior, and they were set free. Later, Yushima helped in the fight against the Gizumon XT, attempting to prevent their attacking ElDoradimon, but it was in vain, as ElDoradimon was transported back to the Human World via a Digital Gate and later destroyed. Yushima and Kamemon then infiltrated a hospital where Thomas' sister Relena was awaiting "surgery" to cure her condition. They tried to sneak her out and learned that Kurata intended to make Relena a Bio Hybrid. He is then captured and Kamemon takes away from him. He figured that Thomas was actually deceiving Kurata, which actually turned out to be true, as Kurata secretly had a backup plan.

Homer's Digivice

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Homer's Digisoul

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Kamenmon Digivolution

Kamemon - Rookie Level

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Kamemon's appearance is based on a PC mouse; the ball on his stomach is the track-ball, his shell is the back of the mouse, and his tail as that of a wire of a mouse. Kamemon is a Digimon who's constantly underfoot in DATS, kindly serving drinks to both human and Digimon alike. In Episode 18, Kamemon went into the Digital World with Commander-General Yushima to help Marcus and the others with Merukimon. He reappeared with Homer in the Holy Capital and helped to defend it from Akihiro Kurata's Gizumon. Homer and Kamemon disguised themselves as doctors upon approaching Thomas H. Norstein's sister only to be caught by Thomas who withdraws Kamemon into Homer's Digivice. When Thomas destroyed the Digimon Control Device that allowed Kurata to control Belphemon, Thomas freed Homer and Kamemon.
Attacks:
Met Knuckle: Rushing towards the opponent by rolling the ball on his stomach, and knuckles by the helmet on his head.
Pointer Arrow: A secret compartment at the top of his helmet opens up and a green arrow shaped missile is fired at the desired target.
Cora Guard: Hides into his body-armour and rebounds the opponent's attacks.
Cora Attack: Butts the opponent with his head.

Gwappamon - Champion Level

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Gwappamon is Kamemon's Champion form. Kamemon first digivolved into this form in episode 18 to distract Merukimon so that the DATS team could go back to the real world. He later helped out in defending the Sacred City from the Gizumon XT. He also fought against Knightmon.
Attacks:
DJ Shooter: Throws CDs from his head.
Gawappunch: His arm elongates to punch the opponent.

Shawjamon - Ultimate Level 

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Shawujinmon is Kamemon's Ultimate form. He first appears in the fight against numerous Knightmon to protect Thomas and his family.
Attacks:
Aqua Vortex: Spins his staff to create tornadoes of water.
River Stream: Crushes the earth with his staff and releases raging streams of water.
Crescent Slash: Thrusts his crescent blade at the enemy.