The ranking for anything goes this way:
G tier: Top 0.02%
SS tier: Top 1.8%
S tier: Top 5.2%
A tier: Top 18%
B tier: Top 25%
C tier: Top 35%
D tier: 45-65%
E tier: 25-45%
F tier: under 25%
Weapon and Specializing Types go this way:
All-Rounder (any type will work)
Swordfighter
Spearfighter
Assassin
Long-Ranger
Gunner
Sniper
Elemental Types go this way:
Null
Flame
Hydro
Nature
Electro
Psycho
Dark
Draco
Fairy
All-Rounder
There can be more than one type of weapons and people.
Also, there are only a handful of Psychos, which are the rarest typing in the world.