A jealous colleague traveling on the same train. His resentment towards Sébastien contributes to the interpersonal friction and chaotic atmosphere aboard the train.
The two men share a professional workplace but have a strained relationship.
Simon is explicitly described as a jealous colleague traveling on the same train as Sébastien.
Madeleine is connected to Simon's professional resentment.
The plot states that Simon missed Sébastien's role because of Madeleine.
Explore the full interactive character relationship map of The Madness Express