He can keep teleportation as long as it's localized within the community! But no ability to destroy entire cities would be allowed, no.

He can keep whatever angelic grace or aura he has. The demons will be uncomfortable with it/back off if they see it. A few may be even more aggressive towards him, if they're particularly brave.

As long as the godling accepts he's on the same ground and position as the humans, not really!

Electronics, clothes, alcohol, cigarettes, etc. There are some boxes that have obviously occult-related items or items that could be used for spells, but nothing entirely useful!