[@Zeroth]: Right, let's get to answering.

[list][*]With a clearer view of the personality, I think that part's fine. The character's reasonings and motivations are sufficiently explained in my opinion, and a clearer view into the dude's mind makes him less the kind of guy you'd say "please touch grass" to and more fleshed out overall.
[*]Back to the hiring motivations on both sides: with an academic history now present, I think hiring him as an intern or trainee (like you have said) makes sense. Of course, whether or not he has to lean more into support or not remains to be seen, but that's a problem for the future.
[*]No mass produced Weapons, no. Anything feeble enough to be disposable isn't going to be of much more use than a normal weapon in the same vein. As for a tell for spiritual energy: it's generally something youkai in general should be able to discern by 'feeling'. More, I'd assume, leaves you able to dump more off to your partner without burning yourself out, while less means you're probably better off with a weapon so you don't burn your stores up. Ain't an end-all be-all sort of thing within context of the world, but if you don't stand out you just won't stand out.
[*]Useful support skills... I'd think that would include the usual business-end stuff (e.g. bookkeeping, scheduling, equipment maintenance), but also a few more esoteric things. For example:
[list][*]Piloting a drone or some other way of getting eyes on the field for live reconnaissance.
[*]Transportation to and from a given location.
[*]Tech support and maintenance. On a more meta level, given that most of the cast seems to be partnered up, there's going to be pretty liberal usage of things that range from "ol' reliable" to "the latest and greatest" in use... And you can't expect people to figure out how to troubleshoot mid-combat without there being a risk of casualties.[/list]
That's just off the top of my head, though.[/list]

[@Pyromania99]: Hey, look, you do you. I'm not gonna shoot a character down because of something like that.

[@Raineh Daze]: Characters fine. Accepted.