at fluminese they have a kasmakaze approach and are very attacking
They do. I don't watch a huge amount of Fluminense but they play Flamengo at least 4 times a year (this year it will be 6, possibly 8 if we meet in the Libertadores QFs), and he's always left a good impression. Fans and commentators alike also rave about him. His manager sometimes drops André into the backline as well, even though he isn't particularly tall. Fluminense's manager is a bit mad - he still hasn't found consistency at the top level but when his team plays well, they look absolutely amazing; sometimes they look like amateurs trying to play from the back though. But I would blame the manager here for how much he puts his players under pressure.
The skillset you get playing under a system such as this, however, seems very translatable to a Klopp team: you run a lot, always join in the press and counter-press, and play your way out of trouble, pass on the floor, etc.
Positionally André is often their most defensive midfielder however in terms of style I don't see him as a 6 in the mould of Fabinho. He's more adept at controlling possession and progressing with it rather than sitting in front of the defenders, like Fab would do.