Rules:
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No undead my gm rules that outside of ethereal enemies like ghosts all undead use their con mod normally and ethereal enemies use wisdom mod
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Dips are allowed but only for 3-4 levels total and the main function cannot scale off class levels. For example water dancers’ Nereid’s Grace
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I start at level 8
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I would prefer to focus on feats since my dm lets us feat buy in exchange for drawbacks.
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My dm does not have alignment restrictions on classes but does place them on deities.
Nereid’s Grace (Su) When
unarmored and unencumbered, a
water dancer adds 1 point of
Charisma bonus per monk level to
his Armor Class as a dodge bonus. If
he is caught flat-footed or
otherwise denied his Dexterity
bonus, he also loses this bonus. He
uses his Charisma score instead of
his Wisdom score to determine the
size of his ki pool and the DC and
effects of monk class features. This
replaces the bonus feat the monk
normally gains at 1st level.
What I've got so far:
Enthusiast cleric
AC Bonus (Ex) When unarmored, an enthusiast adds her Charisma bonus
(if any) to her AC and her CMD. These bonuses apply to AC even against
touch attacks or when the enthusiast is flat-footed. She loses these
bonuses when she is immobilized or helpless, when she wears any armor,
or when she carries a shield
loremaster oracle
Sidestep Secret (Su): Your innate understanding of the universe has granted you preternatural reflexes and the uncanny ability to step out
of danger at the very last second. Add your Charisma modifier (instead
of your Dexterity modifier) to your Armor Class and all Reflex saving
throws. Your armor’s maximum Dexterity bonus applies to your Charisma
instead of your Dexterity Link…
Lore Keeper (Ex): Instead of encyclopedic knowledge, you learn most of
your information through tales, songs, and poems. You may use your
Charisma modifier instead of your Intelligence modifier on all
Knowledge checks.
link
Feats
Self Delusion (Feat): You may add your Charisma modifier, rather than you Wisdom
modifier, to your Will saving throw bonus.…
Scion of War (Feat): You use your Charisma modifier to adjust Initiative
checks instead of your Dexterity modifier.
Other Sources
Best Answer
Paladin is the best class for this, because divine grace is arguably the best single class feature in the entire game. The enlightened paladin can get Cha-to-AC when unarmored, but it’s limited to paladin level so ignore that. Smite evil also adds Charisma to attack rolls, but since you’re limited in who you can apply that to and how often you can do it, you’ll want better for that.
“Better” in this respect is Divine Fighting Technique, for Desna’s Way of the Shooting Star to get Charisma to both attack and damage so long as you’re attacking with a starknife. This also applies to CMB. Since adding an untyped ability bonus to something twice does not stack in Pathfinder, this makes Divine Fighting Technique redundant with smite evil. There is a larger problem, though: Desna is a chaotic good goddess, and Divine Fighting Technique requires that your alignment exactly match your deity’s. Chaotic good characters cannot be paladins. If you are not actually playing in Golarion, however, perhaps the Way of the Shooting Star will be made available from a lawful good deity. Or, possibly, your GM will institute variant-alignment paladins, which would certainly improve the game in general.
If forced to choose, divine grace is vastly superior to Divine Fighting Technique.
Oracle can get Cha-to-AC either when unarmored, or when when armored but limited by the armor’s max Dex. These are both untyped ability bonuses, as is the enthusiast cleric you link, so they do not stack with each other or with that.
The other major source of Cha-to-stuff bonuses is being undead: they replace all uses of Constitution with Charisma. So you would get Cha to HP, Fortitude, and so on.