Meicoomon

Meicoomon is new Digimon from Digimon Adventure tri. and partner of Meiko Mochizuki. Like Gatomon, she is Champion form.

Appearance
Meicoomon is a terse talker, rarely speaking and even then only in short sentences. It is obvious Meicoomon cares deeply for Meiko, however.

Despite being a Champion-Level Digimon, Meicoomon acts very childishly, often wanting to play and eat sweets with the other Rookie-Level Digimon. She can also be very naive and end up causing trouble.

Upon taking her unnamed form, Meicoomon becomes very wild and savage, as shown when she kills Leomon without hesitation.

Reunion
Meicoomon is separated from Meiko Mochizuki and spends the week searching for her, oblivious to the Hackmon shadowing herself. Huckmon eventually catches up to her and signals Alphamon, whose emergence in Odaiba creates an enormous digital disturbance that leads Meiko and the DigiDestined to her, finally reuniting the pair. They are defended by the DigiDestined, who drive Alphamon off. Meiko reveals to the other children that Meicoomon is her partner Digimon, and the two thank the DigiDestined, who welcome them into the fold. They remain unaware of Maki Himekawa's interest in them and of the surveillance she has obtained.

Determination
Following their first encounter, Meicoomon starts to bond with the other partner Digimon. Meicoomon and Meiko join the other Digidestined at Ooedo Onsen. Meicoomon being new to the Real World, ends up getting lost along with Biyomon in the men's bathroom. Later, Meicoomon attempts to aide Togemon in fighting off an infected Ogremon, who appeared through a distortion to the Real World. Leomon, however appears to take Ogremon back to the Digital World.

Later on, Meicoomon is captured by the Digimon Emperor. Palmon, Gomamon, and a partially infected Leomon go after her to fight Imperialdramon. However, after being rescued, Meicoomon seems to turn rogue on sensing Leomon's partial infection. She seems to evolve into a larger, more aggressive form and kills Leomon, before leaving Meiko to escape back to the Digital World.

Himekawa later speculates that Meicoomon herself is responsible for the infection.