Post characters who immediately/instantly или almost immediately/instantly become best/close and/or even lifelong companions, partners, pals, etc. или all of the above

Shinpachi and Kagura immediately became close with Gintoki right after they met, its sort of еще like a family relationship than the ones Ты сказал(-а) so I hope this counts

after living their daily lives alongside the natural permed idiot they became еще and еще like a family..... a completely whacked out family

Natsu, Happy and Lucy (Fairy Tail) become immediately Друзья and partners after Lucy joins Fairy Tail.

sket dance members...bossun,switch and himeko!

Ginji Amano and Ban Mido from GetBackers. It wasn't the MOMENT they met, but close enough!~

Наруто And Sasuke Were Instant Друзья And Rivals :3

Haru&Elie from Rave Master , even though the way the meet was "below the waist", haha, they still became very close Друзья almost immediately.