
Units are ranked from a general standpoint.
It can also be used for Global-first units/EZA/categories that have yet to be released on the JP server. Adding nothing but hard hitters that doesn't synergize with most of the team derails the list as it would often revolve around supporting them instead, which hinders team-building on the intended tier list. It should be noted that just because you can list them under their secondary leader skill doesn't mean that you can add every units there. They benefit from the inferior secondary leader skill of the ideal leader. It can be used for cards that don't fit the type/Category of that list but have traits that either support the team or synergizes very well with either the main leader or other top tier units, sometimes better than cards that are of that type/Category. It is reserved for cards that have some useful mechanic or specific use for some situations despite not benefiting under the unit's leader skills. Honorable Mentions Tier (max 10 units) is not necessarily worse than C Tier. Supports Tier (S Tier: max 2 units, A & B Tier: max 4 units): Support units that may deserve an S, A or B Tier position but aren't on the overal Tier. C Tier (max 50 units) is for units that suffer many drawbacks and lack a place on their team, and are only usable if you have no one else. They suffer from several things which prevent them from ascending higher but can be used until better units are obtained. B Tier (max 35 units) is for filler units. They may suffer from a few drawbacks but are otherwise solid.
Units in this rank are nice additions to their respective teams, and will generally assist in the building of a good team.
A Tier (max 20 units) is the tier right below. (Super & Extreme Rainbow list max 15 units) This includes practically all of the leader units for that type and/or Category. They are excellent additions and in some cases, optimal. S Tier (max 12 units) is for the units at the top of their class. Mono teams such as AGL have fallen out of use in the meta. The teams currently with a tier list are Super/Extreme of 'Color' types, Super/Extreme in general, and Category teams. There are multiple team types in the game and therefore multiple tier lists. The Tier List is a list which ranks units on their importance, effect, and relevance in the current meta of the game.