Charles has never had art. He may get it at some point, since I enjoy writing him.
Metatron is truly an angel, in many senses of the word! She deserves to be happier than she has been. Got a ways to go before she's comfortable or truly happy though, which just makes the eventual result more satisfying.
For the trust question, 1.4 You get... 0.1 or 0.2 trust for every battle you bring them on, it tracks the decimal.