Clarabelle is the former assistant of Kenspeckle Grouse. She is strange, quirky, and dreamy, and most of the time barely listens to what Kenspeckle says. She is also one of the only two people, the other being Thrasher, to like Vaurien Scapegrace, and is best friends with Thrasher. After Kenspeckle Grouse died, she became the assistant of Doctor Nye.
Clarabelle is first seen at Kenspeckle's medical bay. She says that Valkyrie would be dead if it wasn't for Kenspeckle. She then asks Valkyrie if she thinks she'll die one of these days to which Valkyrie responds by saying "I'm not going to die anytime soon". Clarabelle then points out that Valkyrie's jacket is too small for her and asks if she can have it when Valkyrie dies.
Clarabelle first appears carrying two vials filled with liquid when Skulduggery and Valkyrie were in the medical bay. She kept saying to herself "left safe, right unsafe". Valkyrie asks her what she is holding. Clarabelle responds by explaining, in an overly confusing way, that one of the vials contains poison. She then said that the right one would be better to drink. Valkyrie tells her that she has confused herself, as she said the right was bad just before. Clarabelle then drinks the right one and reassures herself that Valkyrie was wrong in saying the right one was poison .
When Valkyrie and Skulduggery see Kenspeckle, he reveals that they were both mineral water.
Clarabelle is first seen at The Hibernian wearing a gas mask. When asked by Tanith why, she says she wants to see what it would be like to live in a bubble, and when she walks away, Erskine Ravel calls her a "delightful lady".
Later on when the Remnants attack the Hibernian, she is fascinated by China Sorrows. She travels with the others to Gordon's house, where she is interested in the Echo Stone of Gordon and is told off when her head goes under his chin, and she pokes her fingers through his head.
During the attack at the Hibernian, Clarabelle is nearly killed by someone who is possessed by a Remnant, but is saved by Valkyrie. Clarabelle is possessed by a Remnant and kills Kenspeckle with a scalpel. She then attacks Valkyrie with the scalpel and cuts her cheek. After the Remnants are captured, she realises what she has done and runs away. Valkyrie expressed her sorrow when they realised what had happened inside Clarabelle's mind - really horrified by what she had done, as Kenspeckle was like a father to her.
Clarabelle is introduced when she meets Scapegrace and Thrasher. She reveals she has dyed her hair blue in an attempt to leave her past life behind. She traveled with Scapegrace and Thrasher in their ice cream truck to visit Nye in the Irish Sanctuary in search of a job. She was granted the job and the two zombies were told to leave.
Clarabelle appears in the book when Valkyrie and Skulduggery bring the recently sedated Ed Stynes to the Sanctuary. She is informs them of how she recently cured a patient of bubonic plague, although it was only just a splinter before skipping away.
She appears much later in the book when Scapegrace and Thrasher arrive in the Sanctuary to speak with Doctor Nye. She seems pleased to see them both alive and somewhat well although is reluctant to allow them to speak with Nye after he turned them away once before. However, they are interrupted by Nye who finally agrees to remove Scapegrace’s brain into that of another body for the payment of the White Cleaver’s separated body parts.
She is rescued from wraiths in the battle by Scapegrace and Thrasher who distract them by calling them over which leads to them being killed by a sheriff. She then proclaims that they are her best friends and ask if she can live with them. Scapegrace and Thrasher agree.
She is seen wandering the corridors of the Sanctuary, trying to look busy so she wouldn't get kicked out. Later, she informs Thrasher and Scapegrace that their original bodies were still kept in the Sanctuary, and agrees to take them there. She tricks Doctor Synecdoche into letting her into the restricted area, but is later caught with Thrasher and Scapegrace.
Clarabelle acts very innocent, childish and nonchalant. While it is widely assumed that she is just very strange rather than stupid, this hasn't been confirmed. She is very forward when talking to other characters.