Action/fighting/horror/mindgames/sports/adventure series where the main characters all DO NOT KNOW EACH OTHER well already upon introduction

[Warmmedown]

Someone helped me come up with this topic.

Specifically the characters involved with the parts of the series that are of this topic title's genres.

Naruto: even Sas/SakuRAH/Naruto don't

OP: all the Strawhatwaras

Hunter x Hunter

 

[SSJ2]

Liar Game. Nao and Akiyama.

 

[Fantastische Hure]

The series this forum is named after…