Roger is an elderly man with a balding head of white hair and light-colored eyes. He wears small, round glasses and a brown coat.
According to Death Note 13: How to Read, he is described as grumpy and studious. He dislikes children and likes books about insects.
Roger is a close friend of Watari's and took control of the orphanage, Wammy's House, when he left. His job is to assemble talented kids and raise an heir to the L name. In Death Note Relight 2: L's Successors, he hosts an event at the orphanage before the start of the series where L, through a computer screen and without a voice scrambler, speaks to the children and answers their questions.
After L and Watari's deaths, he receives a text message on his cell phone that reads, "L is dead." He leaves his office and sees a group of children coming inside from the orphanage courtyard. He removes Mello's hand from a smaller boy's hair and tells him and Near to come to his office.
In his office, Roger sits at his desk and informs them that L is dead. While Near sits calmly on the floor, Mello reacts strongly, yelling and grabbing Roger by his suit, demanding to know if he had been killed by Kira. Roger confirms this likelihood, and Mello asks which one of them had been chosen by L.
Roger informs them that L had not chosen yet and asks Mello and Near to work together. Near is in favor, while Mello refuses because they have never gotten along. He concedes that Near should be the next L because he is calm and uses his head and tells Roger that he is leaving the "institution" to live his own way. Roger tries to stop him, but Mello argues that he, having almost turned fifteen, is old enough to take care of himself. Mello leaves, shutting the door to Roger's office behind him.
In the epilogue taking place a year after Light Yagami's death, Roger has become the third Watari along with Near, the third L.
- Roger possibly makes an appearance at the end of L: Change the WorLd, though the character is not specified to be him.