Misa Amane's stalker

Misa Amane's stalker is a man who is obsessed with Misa Amane.

Appearance
He has short hair and small, dark-colored eyes. He wears a pair of glasses.

Manga
Misa Amane is walking when suddenly a man she has never met before jumps out at her and professes his love. He mourns the fact that she will not be with him, and so he tells her that he will commit murder-suicide. This is to be the way Misa Amane will die; however, Gelus, a Shinigami who has been watching Misa for some time through an observation hole, has developed feelings of love for her. Since he loves her, Gelus had been watching to see how Misa would die and sees that he can prevent her death. Gelus writes down the name of Misa's stalker in his Death Note, specifying that the man drops the knife and walks away. The man does this and dies of a heart attack immediately after. Having broken an important Shinigami Rule, Gelus dies as a punishment, leaving his notebook behind.

Rem, a Shinigami who had been watching Misa with Gelus, curious as to how she would die, takes the Death Note and drops it into the human world for Misa to find, as she deems to be appropriate in light of the circumstances. Misa finds Gelus' notebook and eventually meets Rem.

Film
Misa has a stalker in the live action film Death Note: The Last Name; however, this one is much more fleshed out.

Known as Ryotaro Sakajo, he is the assistant director of Misa Amane's "Misa-Misa's Happy Sweets" cooking show. He is obsessed with Misa, first seen watching her filming. Off-set, Misa blows her nose and throws the tissue into a trash can. When Misa leaves, Sakajo takes the tissue from the trash and puts it in his pocket. He presumably follows Misa outside after she leaves the TV station, eventually causing her to flee. In a sequence bridged between the two films, Sakajo corners Misa and brandishes a knife, stating that he wishes to reunite Misa with her family and die with her. Gelus, watching from the Shinigami realm, kills him to save Misa's life. In doing so, Gelus dies and his Death Note drops near Misa.