Digimon Season 1-5
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Tommy Himi

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Tommy is the youngest member of the group, and was chosen to wield AncientMegatheriumon's power through the Spirits of ice. When the audience first sees Tommy, he is being bullied by two older boys, who push him onto the Trailmon that brings the Chosen Children into the Digital World. During the course of the adventure he encounters the two again and they try to bully him again, but Tommy points out that he's stronger than they are now as he can fight for himself and doesn't hide behind others. After he saved one and digivolved to Korikakumon to protect them, they realized he was right and apologized to him for their actions. Tommy became friends with his former bullies and later got a little revenge by pushing one on the train when he went home so the two were even at the former bully's own suggestion.

Tommy is always genuine in his feelings and looks up to 
Takuya Kanbara as his hero. As the series progresses, Tommy learns to stand up for himself, even fighting his own battles. He learns to become more brave and self-reliant over the course of the series. Unlike the others Tommy only ever defeated a foe on his own once to the point of destruction. He purified the Chamelemon and defeated them, but they reverted to Armadilomon. The only evil Digimon he ever killed was Asuramon when he was in Sakkakumon's Fire Sphere. It was also the only time he ever battled by himself. Before he didn't understand the true meaning of friendship and was somewhat spoiled which his brother tried to stop, but after Asuramon tried to use him and Tommy killed him, Tommy finally understood what his brother meant.

Tommy's Digivice

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Tommy's Digivolution (Spirit of Ice)

Kumamon - Human Spirit Level

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Tommy can become this bear-like Digimon when he uses the Human Spirit of Ice. He first appeared on "Kumamon Baby, Light My Fire". Kumamon resembles a small ice bear with a green headband around his head. Tommy first Spirit Evolves into Kumamon to help Agunimon fight against a Candlemon. Kumamon helps Agunimon locate the real Wizardmon, who had digivolved from one of the Candlemon. Kumamon is the smallest of all 10 legendary warriors.
Attacks

Blizzard Blaster: Kumamon swiftly fires strong snowballs from a snow ball gun which he always has with him
Crystal Breeze: Kumamon blows cold wind from his mouth to freeze his opponents.
Frozen Tundra: Kumamon attacks by turning into an icicle.

Korikakumon - Beast Spirit Level

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Tommy turns into this Digimon when he uses the Beast Spirit of Ice. Korikakumon possesses the most raw, non-elemental power out of all the Beast Spirit Digimon. He wields two battle axes, named "Eji" and "Oji". Tommy receives his Beast Spirit from Datamon in "Bizarre Bazarr", when it was found as a prize in a game cartridge after Tommy won, and digivolves into Korikakumon for the first time to fight Arbormon. Though it never went into a fit of rage with lack of control from Tommy, when not in control it does stop to pray.
Attacks

Avalanche Axes: A combination of cutting-attacks using his two axes. This attack also fires a blast of ice and snow shaped into an arrow.
Frozen Arrowheads: Korikakumon wraps the arrow heads on his braids around an enemy, holding them in place.

Susanoomon - Mega Level (Ancient Spirit Evolution) (All Ten Human & Beast Spirits)

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Susanoomon is created when all twenty spirits left by the Ancient Warriors are fused together, and possesses the combined powers of all 10 Legendary Warriors. He somewhat resembles Omnimon from the first season. He's by far the strongest of the Legendary Warriors, and the only Digimon in the series strong enough to fight Lucemon.

When Koichi sacrificed himself to save the others from Lucemon Chaos Mode, he gave his Spirits of Darkness to his brother Koji. Takuya and Koji then brought all twenty Spirits together and became Susanoomon. In this form, they fought against Lucemon twice, the first time against Lucemon Chaos Mode, and then again to stop Lucemon Shadow Lord Mode from entering the human world. In this second fight against Lucemon, all five children combined to form Susanoomon and was able to penetrate the shadow-sphere where Lucemon Larva was hiding. In the final battle, Susanoomon managed to shatter the shadow-sphere, destroy Lucemon Shadow Lord Mode, and then split into the 10 separate Legendary Warriors and destroyed Lucemon for good.
Attacks:

Celestial Blade: Susanoomon fires a blade of energy from his sword that can be used to cut his enemies in two. The sword he uses is enormous, the blade of energy it generates is at least thousands of feet long.
Heaven's Thunder: Susanoomon creates clouds which fire enormous bolts of energy down onto his enemies.

AncientMegatheriummon - Mega Level (Ancient Warrior of Ice)

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AncientMegatheriumon is an Ancient Beast Digimon whose name and design are derived from "Ancient" and the prehistoric Megatherium. It is the Ancient Warrior representing the element of ice. It is said that the power and bravery it possesses can adapt even to the intense cold of the freezing tundra. Its abilities were given to the "Mammal" and "Icy" types of Digimon. AncientMegatheriummon's power now lives on in Tommy Himi, who wields the Spirits of Ice he created.
Attacks

Freezing Blizzard: Generates a super-blizzard at absolute zero which suspends the atomic movement of every object.
Great Snowplow: Performs a super-charge which easily destroys even the eternally-frozen gigantic icebergs.