I was wondering if there were any anime where the main character has a particular partner

Example partners:
Yusuke and kurwabara (yu yu hakushou)
Tsuna and reborn (katekyo hitman reborn)
Natsume and sensei (natsumes book of friends)
Lina and goury (slayers)
Serena and rini (sailor moon)
Ichigo and rukia (bleach)
Naruto and sakura (naruto shippuden)
Kirito and asuna (sword art online)
Negi and asuna (negima)
Miaka and tamahome (fushigi yuugi)
Naru and mai (ghost hunt)
Yugi and joey (yugioh)
Tyson and daichi (beyblade revolution)
Tsusuki and hysoka (descendants of darkness)
Yuki and luka (uraboku)
Goku and vegeta (dragon ball z)

Naruto and sasuke (naruto)
Hijikata and chizuru (hakuoki)
Zelgadius and amelia (slayers)
Sasha and mafyuu (sekion no qwaser)
Yuri and conrad and wolfram (kyo kara maoh)

You when the main character has that one particular partner that their close too and they got eachothers backs even in a fight or emotional support. Any anime will do except hentai and yuri. Eicchi can be alright but only if its like sekion no qwaser. Thanks and sorry if I misspelled any names wrong.
they can have more than one partner but two is my limit.