How do you guys make use of the favorite system?

I got so used to the 1 favorite only, that I didn't even start sorting heroes like that.

I have all my 5 stars favorited (with the exception of extra copies waiting to be foddered) and lower rarity heroes with optimal IVs are also favorited just so I don't accidentaly fodder them off.

My use of this system is straight forward but i used to it,
1) 5* & 4* i use excluding raven tome mages
5) raven tome mages bcz i couldn't find them
I dont need more categories for 2 reasons
1) i dont have troubles to find unit i need at the moment
2) too lazy to organize 60+ units
All else is for fodder and 4*+10 that needs skills and merges.

1. Perfect IV
2. Perfect boon - neutral bane
3. Perfect boon - suboptimal bane
4. Perfect boon - bad bane
5. Good boon - neutral bane
6. Good boon - bad bane
7. Seasonals with neither good or bad IV
8. Seasonals with bad IV

This way, even if i don't remember well the IV of the character i know if i can get a better IV spread of said character or not

1. Normal. All 5* copies with best IVs that I have (so if there are multiple copies, the one with better IVs gets favorited)
2. 4* Supermerges
3. GHB & TT units
4. none
5. Legendary Heroes
6. none
7. none
8. Other (units for GHB guides and stuff so i don't merge by accident)

Well i only have them up to 7. The last one i'm not sure

1. 5* units that i use with good/perfect IVs
2. Fodder material
3. Merge Material
4. Unsure of what to do
5. Summoner support
6. 4* Units with good/perfect IVs that will be brought to 5* sooner or later
7. 4* Units with mediocre IVs and waiting for better ones

I do like to color code my neutral/free to play (F2P) guide video units. Like 5* and 4* Clarisse get used in different videos, so I take advantage of that. I've also built a custom Zephiel for my armor emblem team, but can also use his default kit for F2P vids.

However, the rest of those are quite interesting ^w^ I think personally, I might lean towards coloring by movement types and Tempest/Arena/Story teams.

Favorite 1 (pink): for units i use and fodder skills to.

Favorite 4 (green): for units i have copies in favorite 1 for merges.

Favorite 7 (purple): for units with skills for fodder.

Those are the colors i use to quickly spot which units are for and for units without hearts i send home for feathers.

I am considering using a variant of Sacred Spear's, though I'm thinking of using the Pokémon stat colors (Res will be rep by sp.def, while the rest are self-explanatory, though I can use Sp. Atk's color for HP, since Pokémon has no HP boons).

Will decide on neutrals.

I thought of using the colors to denote origin, but my barracks kinda did it on its own, so...

Edit: 2 for +Atk, 3 for +Def, 4 for +Res, 5 for neutrals, 6 for +HP, and 8 for +Spd. Anyone on 1 are still awaiting assignment, while 7 will be unused.

I use mine to keep my teams sorted, so I don't loose anyone.
1.) My absolute favorites in my main team
2.) Horse Emblem
3.) Flier Emblem
4.) Armor Emblem
5.) Infantry Emblem
6.) Mixed Emblem
7.) Mage Emblem

Honestly I only use the favorites for characters I use or may use. With 1 being for my merge projects, 8 being for units I may use typically 4*s with good ivs. And then the rest I kinda just dumbly pick what color matches the unit.
Like Ephraim has light blue hair, so he gets the light blue heart.