Roe2

"I understand perfectly! The black stuff being poured here is a sauce, then does that mean the black stuff being poured is soy sauce?"

- Roe2, Volume 8

Roe2 is Shiroe's alternate character avatar, a Half-Alv Summoner-Vampanella. Although she was originally on Mare Tranquillitatis, her body ends up being used by a Fool who is intent on finding out who was rightfully in possession of Theldesia's Empathiom, whereas the Genius are simply intent on harvesting it by killing Earthlings and Adventurers alike. As a result, Roe2 primarily opposes the Genius and aids her "big brother's" (Shiroe's) cause.

Appearance
Roe2 has the appearance of a tall woman dressed in a white coat wearing glasses, with rather voluptuous curves - the latter made KR and RamMutton dub her "Ero-ko". Notably, she dons the same cloak as Shiroe and bears a striking resemblance to him. In spite of that, few people have figured out that she was actually Shiroe's alt.

Personality
Roe2 is naive about Adventurer-created items such as food, and is rather curious about them, considering that the mind in control of the body is a Traveler, who normally are ephemeral. While quite simple and straightforward, she is logical and intelligent, as prove her actions and thoughts when accompaning her young party. Her masculine manner of speech gives people the impression of her being easy-going.

She takes a liking to being called "big sis" by Touya and Minori, and complains that her "big brother" (Shiroe) gave her an inconvenient subclass. However, despite taking a liking to Touya's Party, she finds human societies illogical and claims that they have an inefficient social structure.

Before the Catastrophe
Roe2 was Shiroe's alt on the beta test server, which he used to try and experiment on the content of future pack extensions.

After the Catastrophe
On Mare Tranquillitatis, the alt's body ends up possessed by a Fool who decides to go to Yamato to investigate. She uses Castling (which switch the positions of a Summoner and one summon) to get from the Moon to Theldesia. Her knowledge of the Earth and Theldesia comes from Shiroe's chat logs (both voice and text) and she uses this stored lexical memory to speak and communicate. Before crossing paths with Touya's Party, she traveled alone without companions, which did not help the least with her lack of knowledge and understanding of the cultural/civilized aspect of mankind.

Gold of the Kunie arc
After the Abyssal Shaft Raid Party wipes out, Roe2 appears near Seventh Fall, rising out of the snow and staring at the moon. On Mare Tranquillitatis, Shiroe notes that he had created an alt, meaning Roe2, on the test server.

Route 43 arc
Touya's Party, while traveling in the Sakawa Region, encounters a group of People of the Earth facing against a horde of Ogres when they first hear a voice through the trees warning them of more higher level ogres being on the way. As the Group is fighting the monsters, Roe2 appears out of the forest to join them in battle and summons a Princess Wraith to aid them in battle. She also formally introduces herself to the group and reveals that she is a vampire, as shown collapsing under the heat of the sun. In order to change her "cumbersome" subclass, she is also traveling to the south.

She mentions that she was on the moon, having switched with somebody approximately three months before the group met her and landing in Oou (the location of the Goblin King). After staying with the group in the town of Yuyugi, she volunteers to help them as long as they treat her like an older sister.

When hundreds of Wyverns invade, she watches with Touya and Minori as the Odysseia Knights charge at them, recklessly killing and being killed, even by their own men. They would revive soon after at their portable shrine and simply return to battle, prompting Roe2 to comment that they seem to be addicted to death. She continues on to say that she finds human social structures illogical and inefficient. At this, Minori, who has been curious about her existence, asks who she really is.

She explains who she is, but engages in much jargon that extends beyond both Minori's and the reader's understanding. Then, she participates in the battle, determining to assist her first friends in their attempt to save the town. After the battle, she departs after handing Minori a letter and requesting something from her.

Noosphere arc
The volume begins with Roe2's letter, addressed to Shiroe, which was written while Touya's Party was in Sapphir. The preface explains that she is a Traveler, a race of mental bodies that were brought to the world of Theldesia because of the Catastrophe, which they called the Eclipse (its kanji means "pact"). She continues to explain that her race is split into two factions: Fools and Genius, although she does not explain why at the moment, but states that this was the reason why she couldn't properly explain things to Minori. While the Travelers had an explanation for the Catastrophe, it wasn't a solid principle and they had no solutions as to how to return to their own world.

After splitting from Touya's Party, Roe2 fails the quest to remove her subclass (probably because of its difficulty) and gives up. She then heads for the Ruin Island Jaxea via Ikoma, which is Elder Tale's equivalent of the JAXA Space Station, and becomes its guardian. Around the time the Shibuya Raid Team defeated Taliktan, Roe2 single-handedly protected a rocket ship at Jaxea from the swarms of monsters, then wondering aloud if she had helped Shiroe and her "little siblings".

Official Manga
Although she isn't seen, when Shiroe first logs on after downloading the Homesteading the Noosphere expansion pack, her name, level, class, and location are seen in one panel. This is also her first official cameo in the entire series.

Log Horizon: New Adventure Land
Roe2 has three different iterations in the mobile RPG: one Super Rare form, the Legendary Rare [Castling] form, and her Ultimate Rare form.

Equipment
Roe2 fights using the Necromancer built, commanding different types of undeads and spirits. Her trademark is the red-eyed Zombie Bat.

Trivia

 * Roe2's existence was first teased in Hara Kazuhiro's manga, where Shiroe's login screen showed that he had an alt. When asked about it during a 4chan Q&A session, Mamare Touno confirmed she would be a major character in the future, but also said "it's a secret!".
 * Being Shiroe's former alt avatar, Roe2 speaks with a masculine tone (but still a feminine voice).
 * Roe2's birthday, May 3, is the day of the Catastrophe. Whether this "birthday" is the day her character was created or whether it reflects the day that the Fool currently residing in her body took over is unknown. However, because Coppelia is also given a birthday (May 25), it's possible that Roe2 that it is the former.
 * Her Sword Princess: Al Quinje seems to be an incarnation of one of the Ruquinjé, and Roe2 claims to have ties to them.
 * The lhrpg database says that when Roe2 and Shiroe will meet, the story will reach its final stage.
 * Roe2's cooking skills (subclass aside) is below what an elementary school student has. This is because Shiroe himself isn't much of a cook and consequently do not talk much about cooking or recipes in the game.
 * Though Roe2 has not been officially confirmed as Log Horizon's Summoner, there have been many hints that she will be:
 * In the mobile game's character archive, most characters are grouped by their affiliation/guild. Roe2, despite officially being listed as independent, is placed on the first page between Tetora and Marielle, while most other independent characters are placed towards the end of the archive.
 * The teaser for volume 16 revealed at the Re:Fraction exhibit has Roe2 and Shiroe finally meet in what seems to be his office, with Roe2 telling Shiroe she wants to "compare answers" with him.