Remember to read the Tier List FAQ for info like "T" and "N" ratings! If you can't find a unit, try the "Converter" and "Support" lists.
Fire
Water
Thunder
Forest

SS

Completely broken units; most are reliant on dupes. These units should never leave your main roster once you've built them.

Lorelei
BT3
Lorelei
Maggie
MBT
Maggie
Bethlehem
BT3
Bethlehem
Ruby
BT3
Ruby
Tina
MBT
N
Tina
Barton
MBT
Barton
Irridon
MBT
Irridon
Chen'ni
BT3
Chen'ni
Pollux
BT3
T
Pollux
Nemesis
MBT
Nemesis
Siobhan
BT3
Siobhan
Sikare
MBT
Sikare

S

Meta choices. Capable of handling 99% of the game; in fact, the high end S tier units here are capable of hitting the peaks that SS units have. However, they often require a little more support.

Rinne
BT3
+
Rinne
Eicy
+
Eicy
Zhong Xu
+
N
Zhong Xu
Matthieu
+
Matthieu
Faust
Faust
Sariel
Sariel
Tina
BT3
Tina
Kleken
Kleken
Vergil
Vergil
Zarya
-
Zarya
Blanc: PC
BT2
-
Blanc: PC
Yingel
BT3
+
Yingel
Irridon
Irridon
Gronru
Gronru
Beverly
Beverly
Ciel
Ciel
Nikinis
Nikinis
Pact
Pact
Brandy
Brandy
Pasolo
N
Pasolo

A

Off-meta units that can still be pretty potent in their own right. Many units in this tier still hold respectable niches or impressive damage; however, they firmly require team-building or luck to hit their maximum potential.

Lorelei
+
Lorelei
Tiny One
+
Tiny One
Maggie
BT2
-
Maggie
Ruby
-
Ruby
Barton
BT2
-
Barton
Ms. Blanc
-
Ms. Blanc
Pollux
Pollux
Chen'ni
Chen'ni
Nemesis
BT2
-
Nemesis
Pasolo
Pasolo
Siobhan
Siobhan
Sikare
BT2
-
Sikare

B

Units that can either be useful for newer players or players struggling to complete their teams. Still capable of holding their own when given support, but doesn't scale very well in harder fights.

Rinne
Rinne
Maggie
Maggie
Tina
Tina
Barton
Barton
Blanc: PC
Blanc: PC
Nemesis
Nemesis
Unimet
Unimet
Sikare
Sikare

C

Playable, but only barely. Units in this tier are not really capable of clearing the hardest content in the game, even with proper support. Play them only if you want to tinker around with janky effects, or have particular attachment to a certain unit while you do your dailies.

Michenny
+
Michenny
Ansia
+
Ansia

D

Bad beyond the early game.

Seleucid
+
Seleucid