#1 - God Hand, from Berserk
Five eldritch entities that work on fate and causality, beings of unparalleled power that we don't understand, they inspire fear with the mere mention of them. We have no choice but to respect these beasts.
#2 - La Squadra Esecuzioni (The Hitman Team), from JoJo's Bizarre Adventure
Real gangsters through and through, a squad of superpowered mafiosi (all with unique and amazing abilities) that will always fight to the death and give it their all because it's all or nothing. Either they win, or they die, because failure means death to true gangstas.
#3 - Charlotte Family, from One Piece
Dysnfuctional as hell, they can barely be called a family. But that's what I like about them too, and it makes those who do care about their family dynamic all the greater characters. All unique, all super colourful and interesting, favorite pirate crew besides the Straw Hats. (I would mention marines but they are an entire force with various different sub-groups and factions but this is one pirate crew loyal to one captain)
#4 - Shiratorizawa, from Haikyuu!!
After the insurmountable wall that was a certain team in Haikyuu, then there come these monsters that BEAT that team. That's how you up the stakes. The whole match with them felt like the a Dark Souls fight, I can't describe how powerful a presence they have. Bulldozers in the court.