post a character who provides information about the others...

Izaya Orihara, the info broker from デュラララ!! He knows everything.... >.>

Kakuto has over 200 Ninja Information Card, which contain data and personal information about individual shinobi. He spent time during the Chunin Exam gathering information on every participant and puts them on

Hibiki providing current information about the Oracion Seis.

Kyouya Ootori (Ouran High School Host Club) does that quite often especially to and on the Ouran Host Club

Kill la Kill ~Houka

Satsuki Momoi (Kuroko No Basket)

she is a coach of Too academy who provides information about her enemies to her team to make up new strategy...sooo they could win against them.......he he he