Allister: Main character is the heir of one of the most famous ghost Pokemon training house.

Agatha: His grandma and mentor who teach him the way of ghost training. Used to be the world best ghost trainer that subdue and send Giratina to the other dimension.

Morty: His big brother who is the best ghost trainer in the world and the one he look up to. Die half way through the series to motivated him.

Phoebe: His big sister who basically raise him since he was a kid. All she want is for him to grown up and fulfill his dream of become the best ghost trainer.

Fantina: His first rival who he beat up before and now join him on any adventure. He try get risk of her but she will come either way. Always annoy him with rematch request.

Shauntal: His teacher at school who also secret a ghost trainer. After found out he was also a ghost trainer, she follow him because she curious about his power.

Acerola: His childhood friend and also a ghost trainer. She always stronger than him so his goal is to beat her someday.

The title we'll be: Naze watashi wa gōsutotorēnā ni nayamasa rete iru nodesu ka?
English Translation: Why am I being haunted by Ghost Trainers?