This angel giving me the vibes of dokkaebi from ORV, i personally very much like her character. She is such a pushover and airhead sometimes but it makes her funny and cute, good writing.
Platinum Shield? That makes no sense. Platinum is a rather soft metal, not one you would make a shield of. Especially as Iron and even better, steel are so much cheaper. Steel shield would be a much better choice to name that ability.