Wizard, I'm assuming. Feels like that investment in CHA is pretty steep on a class that doesn't otherwise use it for much for a few more HP per skeleton. You're essentially giving up 6 of your own HP by having a +1 CON, and distributing one each to your minions. Their boost refreshes on a short rest, granted, but still.
Options seem to be:
+1 hp per target per short rest (about 18 hp per day, level 1+ potential impact)
+1 hp per level (1.5x level hp per day [including hit dice], +1 Con saves)
+1 AC, +1 Initiative, +1 Dex Saves
I think those options are fairly balanced. I also think that for this character the charisma skills will be more useful than the dex skills. IMO
Also, keep in mind skeletons will help deter most attack style damage on me, limiting the usefulness of AC. IMO
I'd leave CHA at 14 tops so you can start with 14 DEX and 13 CON,
If I was choosing to drop cha to 14 I would go for 12 dex and 15 con.
and then probably take a Hexblade level for medium armor and shields (then I'd take Magic Missile to abuse Hexblade's Curse).
High AC is of limited usefulness for this build IMO. Hexblade's curse is okay - but not worth slowing down wizard spell progression.
Arguably you could even start with low INT without feeling it too much, since Animate Dead doesn't care about your DC, and you could pick other spells that don't care either.
Idea is to keep 6 elite skeletons summoned and still be a wizard. I'm not trying to build for tons of undead.
For example, the following list is entirely composed of spells that are good spells, and either don't use your DC at all or use it only for a secondary use/effect:
1st:
Find Familiar (r)
Detect Magic (r,c)
Comprehend Languages (r)
Shield
Absorb Elements
Sleep
Magic Missile
Feather Fall
I would probably find a way to include fog cloud in this - seems like it could provide great tactical opportunities. Disguise Self seems very useful as well - can potentially hide that I'm the necromancer. Mage armor would be nice as well.
2nd:
Invisibility (c)
Misty Step
Mirror Image
Shadow Blade (c)
Not sure why Shadow Blade?
I love invisibility for this as it can serve as a defacto defensive spell for me and the skillies
Mirror Image just provides AC help. I'm not convinced it's needed. I can use invisibility on myself and run away/hide if in danger.
I'm thinking replace those with some combo of rope trick/suggestion/hold person/(blindness/deafness)
I'm also not sold on misty step. Good spell but interferes in controlling undead and means I'm going somewhere they can't follow.
3rd:
Animate Dead
Counterspell
Dispel Magic
Fly/Haste (c)
Animate Dead and Counterspell I think are musts
I'm a big fan of having some aoe - so either hypnotic pattern or fireball
I'm thinking leomunds tiny hut instead of fly or dispel magic.
I'm not a fan of haste for this character.
I will look at higher level spells later.