Looks pretty good, though I have two notes. One is optional, which is mentioning Galeem somewhere in her bio. You could also at the very list hint at the elements we discussed for her in-world backstory, without mentioning specific nouns. The other thing is that Choose to Be Chosen can't be an absolute blanket immunity against mental effects. She is not without Galeem's influence, after all, and if she were to come into contact with an enemy many times stronger than her with mental powers, it's not guaranteed she'll be exempt. This can be handled just by adding 'most' before 'attacks on her mind'.