Neurons
The Neurons are five animated human characters (stylised with human facial features and body, but no legs) who live together inside Nina's brain and are named to reflect the five senses which they represent:
Felix (Voiced by James Dreyfus in the first series and Lewis MacLeod in the rest), the oldest of the Neurons who is particular about his appearance and speaks in a posh accent. He is coloured green, and represents touch and feel.
Belle (Voiced by Kelly Harrison), the vice leader of the Neurons who can be quite loud and bossy but is still friendly and nice. She speaks in a Northern accent, coloured red with a pink face, and represents hearing and sound.
Luke (Voiced by Patrice Naiambana), the group leader of the Neurons with a laid-back/relaxed personality and speaks in a Jamaican accent. He is coloured yellow, and represents sight and looking.
Ollie (Voiced by Siobhan Redmond), a Neuron referred to as being 'sweet, self-assured and a bit of a goth.' She speaks in a Scottish accent, is coloured purple and violet, and represents smell and scent.
Bud (Voiced by Sharon Small), the youngest of the Neurons and Ollie's younger brother. Being young, can be quite enthusiastic and easily excited within the world around him. As with Ollie, Bud also speaks with a Scottish accent. He is coloured blue and represents taste and eating.
