Incomplete numbered groups.

[u/macho_boy-420]

1. The Self Referential Six (Rick and Morty): excluding and Imprisoning Rhett from the group for supposedly being very dangerous.

2. Uno, Dos and Cuatro (Ferdinand): they don't want to talk about Tres.

[u/M-Shadowtoad]

The Six(Generator Rex): A group of the Six deadliest assassins/fighters in the world. Originally consisted of the deadliest man in the world named One and the 5 he trained. However even after One died and Six left the group, they still go by The Six. Partially because none of the four is willing to dishonor One's memory by taking his place.

[u/Dragonfang65 → u/M-Shadowtoad]

And even then. It is ranked by “Deadliest” in how willing they are to kill. And Six proves he is definitely not the weakest.