Arelith

Maybe make a blackguard helmet also useable by a paladin. It's perfect for both bit seems odd for them to get their own helmet, the class specific helmets always seemed a bit odd to me.

Mechanically a blackguard can't utilize as effectively the spell aura of glory which allows paladins to gain +4 CHA for hours per CL. Paladins really don't need any +CHA items to max their stat out, save Templar Armor.