Roen Yuia

Roen was Aka, Boro, Sachi and Daniel's comrade during one of their trips on the Hell Express. Daniel is actively seeking a way to resurrect her by awakening their nemesis.

History
During Roen's first attempt at taking on the Hell Express, Aka Williams, Boro, Sachi and Daniel were her teammates. During their time on the Train, an unknown Slayer candidate gradually killed everyone onboard until, in the end, they were the only ones left. However after she ended up dying and the others forfeited the train.

Powers and Abilities
As a D-rank Regular at the time of her death, as well as Boro saying she (and three others) were incredibly strong in comparison to himself, one can assume that she was quite powerful at the time.

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Roen