Krog doesn't like you. They're of the opinion that there are only two types of humans: those who are immediately hostile to demons; and those who are initially friendly to demons but drop this facade as soon as it benefits them. Nevertheless, Krog will still form contracts with summoners. Krog can become slightly less grumpy towards humans if they bring them broccoli and peanut butter (Krog's favourite treats from Earth).
Krog earns their living as a medicinal alchemist and a blade-sharpener; primarily selling these products and services by mail order, and occasionally going into town to run a stall for a day. Krog grows and harvests herbal ingredients, and refines them ready for use by more advanced alchemists.
Krog's cross-shaped pupils and powers of light occasionally lead them to being mistaken for an angel by ignorant humans, much to Krog's great annoyance.