"From my point of view, it's a great opportunity," Whithouse told Entertainment Weekly. "Don't get me wrong; it's sad when we lose characters. But, in many ways Being Human is such a Mexican daytime soap. People can return."
The fifth series of Being Human - announced in March - will feature new ghost Alex (Kate Bracken) alongside vampire Hal (Damien Molony) and werewolf Tom (Michael Socha).
"With those three new characters, there's a completely new dynamic and just tons of ideas and stories you can tell," said Whithouse.
However, the writer admitted that he is currently uncertain if Alex and Hal will rekindle their romance in future episodes.
"To be honest, we're still in the storylining process [for series five]," he explained. "Sometimes I can't answer a question because I genuinely can't answer it."