Digimon Season 1-5
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Koji Minamoto

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Koji was the child chosen to wield the Spirit of Light. Koji starts the series as the group loner, but never had the chance to make any friend because he had to change schools too many times. Koji receives Ophanimon's cell phone message while he was out buying flowers for his stepmother. He followed the instructions on the SMS, which led to a subway station where a Trailmon took him to the Digital World. Koji traveled alone until he met Tommy and J.P. and had to save the two from a horde of attacking Pagumon. From then on, Koji showed up to help the other Digi Destined from time to time, and then eventually joins the group permanently. He often distances himself from the others, refusing to let anyone get too close to him. This was revealed to be because he moved a lot, and believes that no matter how close two people can get, something pulls them apart, so he stops trying to make friends and be, as he puts it, 'better prepared for it.' Originally, he is rather cold and rude towards the other DigiDestined, but eventually softens up as he becomes closer to them.

Koji has a rough relationship with his stepmother Satomi, whom he insists is Not his mom. As such, he is distant from his father, who often tries pushing Koji into trying to get along better with her. Around halfway through the series, Koji realises that Satomi wasn't trying to take his real mother's place, but only wanted to be a part of his family. Upon returning to the real world, Koji decides to give her a second chance. Koji also meets his 
twin brother, Kouichi Kimura, for the first time in the Digital World. Koji's parents had split up when they were young, and his mother had moved out with Kouichi Kimura and their grandmother. Koji's father remarried, told Koji that his mother had died, and never informed him of his twin brother. As such, Koji never knew he had a brother, let alone a twin.

Ironically, Koji was the last to find out that Kouichi, in the 
Digital World, was only spirit with a semi-physical form (in the real world, Kouichi fell down a flight of stairs and went into a coma). Bokomon overheard the conversation between Kouichi and Crusadermon, and was forced into telling the others while Koji and Kouichi were out of hearing range. After he returned home he accepted his stepmother and went with his brother to finally meet his mother whom his father had always told him was dead.

Koji's Digivices First White & Blue, Then Blue & Black

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Koji's Digivolution (Spirit of Light)

Lobomon - Human Spirit Level

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Lobomon is Koji's Digimon form when he uses the Human Spirit of Light. Lobomon first appears in "Lobomon: Warrior of Light" of DigimonFrontierTommy and J.P. were being chased by a group of Pagumon and fell into a mysterious chamber. They were found by Koji, who beat off the Pagumon using a pole. However, a Pagumon digivolved into Raremon, and turned the tables against Koji. Takuya and Zoe arrived and Takuya proceeded to Spirit Evolve to Agunimon. However, he lost the fight and reverted to his human form. Trying to push Tommy away from an attack, Takuya accidentally pushed Koji into a deep hole. Raremon's acid attack hit the wall at just the correct spot, releasing a beam of light that revealed Koji's Human Spirit of Light. This allowed Koji to Spirit Evolve into Lobomon for the first time.
Attacks
Lobo Kendo: Lobomon uses his swords to slice his enemies in two.
Howling Laser: Lobomon gathers energy to the weapon on his left wrist, and releases it in a burst of light energy.

KendoGarurumon - Beast Spirit Level

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KendoGarurumon is Koji's digimon form when he uses the Beast Spirit of Light. KendoGarurumon is a wolf-like digimon who can move at the speed of light. It looks similar to MetalGarurumon. KendoGarurumon first appears on "Can't Keep a Grumblemon Down" when the group fought against Grumblemon. Koji helped some Gotsumon by replacing a gem into the eye of a rock, and released the Beast Spirit of Light. Koji became the first of the group to Spirit Evolve with a Beast Spirit, turning into KendoGarurumon and defeats Grumblemon. He had trouble at first controlling the Beast Spirit but quickly got over it.
Attacks
Lupine Laser: KendoGarurumon shoots a beam of energy from his mouth.
Speed Star: KendoGarurumon uses the Wing Blades on his back to slice apart the enemy.

Beowolfmon - Fusion Spirit Level (Human-Beast Spirit)

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Koji assumes this form when he gains the power to combine both his spirits. Beowulfmon first appears in "Stuck in Sakkakumon with You", where Koji was trapped within Mercurymon's Darkness Sphere. Koji fought, and was defeated by Duskmon, forcing him to revert to his human form. About to be killed by Duskmon, Koji started thinking back to all the things he felt he regretted in his life. His will to continue living wakened Seraphimon's Digi-Egg, upgrading Koji's D-Tector and giving him the power to combine his Beast and Human Spirits.
Attacks
Frozen Hunter: He raises his saber forming a giant wolf of light energy, and then takes a slash that is faster than the eye can see.
Cleansing Light: Fires missiles and a laser at his opponents.
BeoSabre: Uses his saber to attack his opponent.

MagnaGarurumon - Unified Spirit Level (Light, Darkness, Thunder, Water and Steel)

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Koji achieves this form when he Unifies the Spirits of Light, Darkness, Thunder, Water and Steel. He fights against, and eventuallydefeats, Dynasmon and Crusadermon alongside EmperorGreymon. This is the form he assumes during most of his fights against Crusadermon. He also fights against the corrupted Cherubimon. When he attacks with any move except Magna Saber, the weapon falls away from MagnaGarurumon afterwards, meaning he can only use each attack except Magna Saber and Starburst Hunter once per use of this form.
Attacks
Starburst Hunter: MagnaGarurumon dashes forward, and surrounds himself in an aura of light as he crashes into the opponent, when he does not have any armor on.
Feral Fire: MagnaGarurumon leaps into the air, propelling himself forward while raining a wave of gunfire blasts down on the enemy below.
Magna Missiles: Consecutive missiles are launched at the opponent.
Magna Laser: Fires two Beam Charges from the cannons on this chest plate.
Magna Saber: Unarms himself and unleashes a fury of slashes with his "Magna Blade".
Starburst Cannon: Fires a powerful blast of light from the twin cannons on his chest armor.

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.

AncientGarurumon - Mega Level (Ancient Warrior of Light)

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AncientGarurumon is the Ancient Warrior representing the element of light. Visually speaking, he is a synthesis of the parts of the Spirits of Light, in a different combination from Beowulfmon. AncientGarurumon's power now lives on in Koji Minamoto, who wields the Spirits of Light he created. In addition to fighting Lucemon, he and AncientGreymon also fought and sealed the evil Digimon Onismon in the movie Island of Lost Digimon. He and AncientGreymon were the last ones standing in the final battle against Lucemon. He revived one last time to help deliver decisive blows against Onismon with his swords.
Attacks
Absolute Zero: Fires a blue ball from his mouth that freezes his enemy.
Sharpness Claymore: Rushes at the enemy, raising his swords in the air and then crashing them down in two diagonal parallel slashes.