How are you sorting your units?

I use the advanced sort. 1 is Weapon type, 2 is Rarity, 3 is level

The units I really care about (I really like them from their original game) are colored purple (my favorite color).

Units I don't really care for as much but still like are colored light blue.

Units I have merges on, but aren't my favorites, are colored orange.

That's pretty much it. xD

I've been doing best IV possible (yellow), best IV I have (purple), and merge project fodder (green).

By now I only used the dark-blue icon, for the characters from my favorite game: Fire Emblem The Sacred Stones (Seth, both Eirikas, Bot Ephraims, L'Arachel, Joshua, Tana, Innes, Marisa and the godness Lute).

I dont care about other units. Maybe i will choose another color for my most used heroes like Grima, Airzura, BNinian, Lilina, Gunnthra, etc etc

Units I love using: Purple (my favorite color for my favorite units)
Units I like using but only use sometimes: Dark Blue
Units I rarely use/Don't like using/Backup Arena Assault units: Light blue
Abandoned projects: Green
Fodder: Yellow
Future units I want to build: Orange
Limited units (GHB, TT): Magenta
Other: Regular pink heart/no heart

I put my units that I use in arena assault as purple since that's the color of the arena assault button.

Fav 1: Units I know I won't get rid of, but haven't touched (AKA every Grand Hero)
Fav 2: 4 Star supermerges
Fav 3: Units I plan to promote and build
Fav 4: Fodder units, usually duplicate 5 Stars
Fav 5: Units that have not been built, or only built with base kits
Fav 6: Units that have some investment, but missing 1 or 2 skills like Repo or Fury
Fav 7: Units that have full kits, just not with optimal skills
Fav 8: Units with optimal builds

Pink for completely built units.Also for 4* merge projects that have perfect ivs (imperfect ivs are not favourited).
Yellow for incomplete.
Green for will merge/fodder.
Orange for needs reposition.

Basic rarity sort