Ryo Takiguchi

Ryo Takiguchi (滝口亮,Takiguchi Ryou) is a member of the Dollars and is in class 1-D. He was the first Dollars member that Mikado and Kida met; Kida simply thought that he "looked like he was with the Dollars" and asked him. He was the one who told them about the mysterious invitations that were apparently being sent out by the Dollars (it is later revealed that Izaya Orihara is the one sending the invitations), and the content of the invitations. According to him the invitation was simply an anonymous text message asking the receiver if they wanted to join a group called the Dollars; the group had no rules except that if asked, you would say that you were with the Dollars. If the invitation was accepted, another text message was sent containing a password and a link to the Dollars chat, where the invitees account and handle would be already set up for them. Like most Dollars, he did not know who sent the invitation, guessing that it must be the leader of the Dollars (this is later proven false when Mikado is revealed as the leader of the Dollars).

He enjoys composing his own music and is often found doing so on the school roof during lunch times. He was one of the Dollars who were attacked during the Yellow Scarves-Dollars gang war; after being hospitalized he stated that he was quitting the Dollars, as being part of the group made him a target and the group didn't do anything anyways. Later, when the Dollars mobilized to save Anri Sonohara from the Yellow Scarves, he happened to be passing by, helping to slow down Horoda and his group by knocking a load of boxes onto them. He explained that even though he said he was quitting, he couldn't bring himself to leave the Dollars behind.

Dollars/ Mika Harima Arc
Masaomi and Mikado ask Ryo if he is a part of the Dollars while he was making music on the roof of Raika Acdemy. Ryo says that he is and the Dollars have no rules and no one barging in orders. Later he tells Mikado that Masaomi is not going to walk home with him that night since the student council were having a huge dissgustion. Ryo was at the Dollars meeting.

Yellow Turban Arc
Ryo tells Mikado that Masaomi isn;t going to school one day for some reason. The next day Masaomi warns Ryo since he is in the Dollars.