The firm will be working on all the Bandai product ranges from now onwards concentrating on boy's ranges Ben 10, Power Rangers and Armouron, girls' range Harumika and pre-school range Tinga Tinga Tales.
Mischief will also offer support across all other product ranges including Tamagotchi, Badge IT!, and PopPixie.
The team will be headed up by Mischief's creative director, Dan Glover and will focus on both consumer and trade PR working with Bandai to promote the product ranges to mass consumer media and with trade at Toy Fair 2011.
Bandai's marketing director, Darrell Jones said: "2011 is set to be a very busy year for Bandai with some great new products hitting the market across all our ranges. We look forward to working with Mischief to maximise the PR and marketing opportunities across all ranges. Toy Fair 2011 will kick off what is set to be an exciting year and partnership".