Anime with a main character who is the background or secondary

Tsubasa Chronicle and xxxholic, kinda? Better to read the manga for that though, the tv anime doesn't cover it and the ovas assume you already have read it

I do recommend teekyuu and the spin off, but it's not really a plot relates relevance, it's basically just more teekyuu

>>332870
JoJo part 4, sorta. The protagonist of part 3 shows up occasionally to give the main character advice and help track someone down.

>>332870
The UC Gundams

>>332870
Yuru Yuri

There was one anime which had the villains of another show as the protagonists. They led some sort of morally grey organization.
I can't remember the damn name though, will look for it today.
Consider this a bookmark.

>>332950
Love Pheromone/Gedou Otome-tai.

Love Pheromone are the good guys but they keep causing collateral damage, and Heathen Girl Squad are the bad guys but they keep accidentally helping people.

>>333004
I found it, it was Zettai Karen Children: The Unlimited - Hyoubu Kyousuke
It is about the villain from Zettai Karen Children

>>332870
Nagato Yuki-chan no Shoushitsu~

>>332870
Gokinjo Monogatari and Paradise Kiss. Mikako (MC of GM) is a secondary character in ParaKiss
Arale from Dr Slump appeared as a secondary character in Dragon Ball and DBS

A Certain Magical Index, Misaka is a supporting character, in A Certain Scientific Railgun she's the main character