I love Brotherhood but the first half pacing really holds it back. Slamming the original series together with Brotherhood at the point they diverge makes an almost perfect series IMO. (I like the original series more than Brotherhood overall.)
But on OP’s topic:
I’m not really sure. I used to read a lot of manga but I don’t anymore, so I don’t really know which series are faithful and which aren’t.
Majin Tantei Nougami Neuro, with this polished to sheen and used as the OP:
Legit among my top 5 Shonen Jump series of all and one of my anime favorite duos. Had a shitty anime adaptation back in 2007 and I’d absolutely pay 300 dollars for a FMA:B or HxH 2011 quality adaptation of the entire manga. Hell I’d pay double just for the entire manga series physically and English translated.
EDIT: Forgot to add the manga Houshin Engi (Soul Hunter) and the same applies to it; one of SJ’s output, the recent anime was such a big flub, and the official English translated manga is also sadly barren nowadays.
And just because I’m a slut for the series: I want a brand new quality remake of the Hitman Reborn!