Due to his psychosis, Renfield eventually breaks the fourth wall (and often his cell walls) to converse on Twitter. He is fully aware of the events of the novel and often of current (21st century) events.Follow @RMRenfield
Renfield eventually betrays Dracula (after inviting him in to the asylum) due to protective feelings for Mina. Dracula opens a pretty big can of whup-ass on him, but Renfield lives long enough to warn the heroes.
In our continuation of the story, Renfield has turned into a vampire, but not yet successfully returned from the grave. He’s still stuck in his coffin, tweeting away.