Help Select feats

[Major]

Alright, I've posted various threads asking about classes, asking about how feats work, etc. Now its time for the final steps in making my succubus. feats.

Right now the current plan is Redeemed Lawful Good Succubus 12 / Paladin 2 / fiend of possession 6 (order might change)

Someone told met that according to the evil subtype that subtype can be used to qualify for PrCs which makes some amusing concepts. Can somebody confirm or deny this? I heard mixed reports from different people?

Anyways, I need feat help because lots were suggested and I only get a few.
1
4
10
15
18

My very limited feats make it a bit rough...

Here is a list of suggested feats
-Improved Unarmed Strike - >Improved Grapple (will have to be post-battle dancer)
==Reason: Help do energy drain attack on unwilling
==Counter: Just use suggestion or something to make them willing, prereq feat slows you down

-Life Drain (post energy drain)
==Reason: Makes your energy drain better

-Combat Charm (post charm monster)
==Reason: Charm in combat no penalties
==Counter: Your charisma is godly who cares?

Improved flight (whenever)
==Reason: Average flight speed sucks

Iron Will -> Mantle of freedom (whenever)
==Reason: Add charisma to grapple checks, escape artist, and +2 to breaking bonds. The grapple is the big one
==Counter: Iron will prereq on a limited feat suuuuuucks. See also, improved grapple

So, opinions on each, or on alternate feat suggestions?