How do you organize your favorites?

I use mine for utility purposes. I have good memory so I can remember which units ive hm farmed so I use them for ivs

Green is tragic, Blue is neutral, Orange is almost perfect, Pink is perfect. I mark one Ghb Yellow so I dont lose it, but now with holy grails its kind of whatever

1: generic for 'don't send this one home/to the library"
2: marked for send to library whenever I get to it
3: yellow, right? neutral IV
4: dancers
5: good IV
6: ideal IV
7: working with this one for now
8: skill inherited to this unit; don't send to library without double-checking

Not the best system, but I really like having all the dancers and singers at the ready like that and I can definitely recommend it.

I'm probably the weird one, but this is what I do:

1: F2P (any units that have been given out to us for free, like GHBs, TT rewards, etc)
2: Neutral (neutral IVs)
3: n/a
4: Optimal HP
5: Optimal Atk
6: Optimal Spd
7: Optimal Def
8: Optimal Res

The last five I use to denote my optimal IV units, based on which stat is their optimal boon I pulled (for example, my Sheena is +Spd/-HP, which is the optimal IV for her 170 BST, so I marked her with the Optimal Spd heart)

I'm probably the only one that uses the hearts like this, but it helps me know which units to keep and which to turn into combat manuals.

The first 4 are by movement, the the last three are the unsortables which include dancer, healer, and legendary. I leave 1st heart to general and turn it off.

* Legendary hero's
* perfect/best at the moment iv 4*
* 5*'s
*free units

By different colors. I order them in the order I want they to appear (not for IV, etc). So I can pick them easier and I have to to look for them on the entire list. I give my "chosen" color (dark blue) to FE8 heroes. I have 2 chosen colors: dark blue and light blue. Light one is for support heroes I always use (they are dancers and some special heroes liek Genny and Jaffar)

They appear on this order:
1) Sacred Stones heroes
2) Top supports
3) The rest of the heroes.

All about IVs
1 - perfect IVs
2 - best boon and 2nd best bane.
3 - 2nd best boon w/best or second best bane
4/ best or second best boon with a bane that ideally should be left neutral
5/ IVs that are better than neutral (usually w/ best bane)
6/ neutral IVs
7/ Best boon but worst bane
8/ boon and bane that ideally would both be neutral