Erika Mishima

Erika Mishima (御島 エリカ) is a character in Digimon Story: Cyber Sleuth - Hacker's Memory. She is the younger sister of Ryuji Mishima and also a member of the Hacker Team Hudie. Her Enjoy! Chat avatar is a Morpho Butterfly named Bu773rfly.

Appearance
Erika wears her Blue Hudie coat like a cape while sporting a yellow coloured sleeveless dress with frills underneath that ends unto her top part of her legs. A small plush whale named Toto sits on her coat's left shoulder. While on her V.I.P. room, she holds a big whale plush named Memetan that acts as her keyboard.

Description
Erika is described as a tsundere by her brother and Chitose. Although she cares for Ryuji the most since he's the only family left after their parents died in an accident. Sometime after that, she became afflicted by an unknown disease that causes her brain to rapidly process as much information as it normally should. She has been in and out of the hospital because of her disease. Her only option is to give a temporary relief and store most of her memories in a virtual memory storage located in the EDEN, and in turn she has access of the storage even if she's not at the hospital.

Erika gets annoyed at Chitose saying that she is "not feminine", but her behavior changed after Keisuke joined their team.

Etymologies
Name used in Digimon Story: Cyber Sleuth - Hacker's Memory.
 * Erika Mishima (御島 エリカ)
 * Ja: Mishima (御島). Japanese surname that means "honorable island".
 * Ja: Erika (エリカ). A Japanese feminine name. It is commonly used in Western Countries as Erica and derived in Old Norse as "Eternal Ruler".

Digimon Story: Cyber Sleuth - Hacker's Memory (Manga)
Erika Mishima arrives alongside Ryuji Mishima, Cyberdramon, Chitose Imai and Wormmon, in which Ryuji helps Keisuke Amazawa defeat the Digimarket Hacker's Triceramon, Tyrannomon and Monochromon.

Eater Legion
Eater Legion is the form Erika takes after being attacked by her Eater Bits. It uses Erika's memories and learns of hers and Wormon's desire to go to the Digital World. It then takes on this goal for itself, attempting to break its way into the Digital World.

Hudiemon
Hudiemon is the resulting form of the merging memory data of Erika and her partner Wormmon in a Champion level Digimon with humanoid appearance and butterfly features that solely gives the essence of their Hacker Team Hudie.

When Keisuke, Ryuji, Chitoise and Wormmon try to save Erika from being Eater Legion, she states it is too late and that she is fully assimilated with it and tells the boys to kill the Eater. Suddenly Erika's memory banks appears as Erika, then fuses with Wormmon to create Hudiemon. Due to her becoming a Digimon, Erika's actual data were transferred to Wormmon as a whole and making the latter as a new vessel. Hudiemon then helps to kill Eater Legion and then Eater EDEN who also merges with some of Erika's memory bank data. When the World resets due to Aiba defeating Mother Eater, Hudiemon decides to stay in this form, as if she returns with Keisuke, with no EDEN in the new universe - the car crash will badly hurt her and her parents, with only the latters surviving from the accident, after she will not be able live much longer giving her incurable disease. Rather than willingly being killed, she chooses to live in the Digital World and in the new universe, she no longer exists - with Ryuji as an only child.

It has some significant process to Biomerge Digivolution since; (1) The Tamer and Digimon are on their digital state, and (2) It is only possible to do inside the Digital World and we can call EDEN a Digital World but also in term a man made.