Hmm, so this guy is the exact opposite of a glass cannon. Effectively 0 attack and 100 defense makes low-level adventuring a real pain for him, especially against weak monsters where reflect won't help; now that makes things a bit more interesting. He can't die, sure but he also can't kill weak enemies if his money depended on it. Also Fey is probably lying about humans not tasting good, because why would she try to eat him last time then?
Their easygoing, "IDGAF I'll eat like it's my last meal" attitude at the feast was funny. Both of them are shameless gluttons. I guess I'll give this a chance if it keeps leaning into the comedy direction. There's way too many serious power fantasies already anyway. If this turns out to be a less serious story like Konosuba I'm going to enjoy it better.
So... healing as a function of barrier magic? That's kind of stretching it, isn't it? Reminds me of those "healer" manga where "healing" is used in questionable and barely valid ways to defeat enemies.