Ichigo Kurosaki & Kon vs. Millipede-like Hollow

Ichigo Kurosaki & Kon vs. Millipede-like Hollow is a fight during the Agent of the Shinigami arc.

Prelude
Rukia purchases a dispenser of soul candy from the Urahara Shop, to allow Ichigo to separate his soul from his body without her help. Unbeknownst to her, the dispenser actually contained a Mod soul. When the Mod soul takes possession of Ichigo's body, he goes off on a spree which eventually brings him to the middle school where Ichigo's younger sisters attend. After a violent encounter with three schoolboys, the Mod soul, later to be known as Kon, is about to leave the school when he senses the presence of a Hollow and doubles back. He arrives in time to save the boys from the attacking Hollow.

Ichigo and Rukia, who have been searching for Kon to get Ichigo's body back, also arrive at the school and Ichigo joins Kon in fighting the Hollow.

Battle
Kon flees to a rooftop to take the fight away from any Humans. He was able to stop the Hollow's attack, but in the process sustained a hit and is bleeding. The Hollow taunts Kon, saying someone as weak as him should not have interfered with his meal. As Ichigo arrives, he agrees with the Hollow's sentiment, emphasizing it by chopping off one of its legs. At first Kon doesn't understand why Ichigo saved him, but Ichigo reminds him that when he uses his body to fight, he puts it in jeopardy. As he talks, he points at the Hollow with his large sword, injuring him in the process. Kon claims he was only fighting because Ichigo took so long to arrive, and he had to protect the children. The aggravated Hollow attacks but is met with a double blow from Ichigo's sword and Kon's leg. This blow effectively finishes the Hollow, but as he is falling he threatens to crush a trail of ants, and Kon hurriedly kicks him away to prevent that, putting himself (and Ichigo's body) in danger of falling off the roof, before Ichigo manages to grab him by the shirt.

Aftermath
After the fight Ichigo gets to know Kon, his history and his stance about sanctity of life. When Uraha arrives to retrieve his "damaged goods", Ichigo and Rukia decide they will keep Kon and take responsibility over him. It is then that Ichigo gives him the name Kon, as well as a surrogate body in the form of a plush lion doll. Kon moves into the Kurosaki Clinic and becomes an alternate means for Ichigo to turn into a Shinigami.

Trivia

 * In the Anime, when Kon kicks the dying Hollow away, he does so to protect Hashigami, Kaneda and Ino.