Is there any way to add skills to demons other than fusion inheritance?

[Nabudis]

Im a good ways into the game and If there is I missed it, but I'm really starting to feel like the answer is no. Looking back through the history of megaten games you had stuff like level up random skills, skill cards, essences etc, just any way to modify a demons moveset after its been created, and far as I can see there's just...nothing at all in this? Its further compounded by the fact that demons appear to both have an invisible physical or gunfire type that dissalows them from learning any skills of the other kind, as well as being unable to learn certain other skills through inheritence that is also not stated anywhere beyond "can't learn skills of an element they are weak to".

[Nabudis]

This normally wouldn't be an automatic dealbreaker but I am having SO MUCH TROUBLE getting even bare minimum functional skillsets on demons nommater how carefully I fuse. I don't feel like I should be halfway through the game and still be struggling just to make a demon with like, a single elemental and phys/gunfire skill consistently, most of the time I'm dealing with random garbage, bad type matchups like physical skills on demons that specialize in Wind and ice magic, so much damn ruin skills and crappy dodge passives for elements they arent weak to. Hell sometimes it gets so bad I can't even -fill all six skills slots- without taking worthless or redundant things, even though I fused them off of two demons who were done learning skills and themselves were slot capped before learning these skills, because the end result is unable to learn so many damn things that I just cannot pass on enough useful stuff.

Its just so jarring coming off of SMT5, where I had the option to use essences to totally overhaul demons skills after creation, and literally never even needed to cus I had so many inheritance options that they came out with 8 slots full of useful stuff right from go.

It feels like this game tries to be more approachable than alot of other megatens with simplified systems, but in doing so gutted the skill system so much that you can't properly use it. I assume the massive list of "cannot inherit" skills demons have, something that just didnt exist at all in most megaten games, is intended to narrow a specific demons scope to make them easier to utilize, which is fine on paper, except that default movesets for demons in megaten games are terrible and literally always need to be customized to work, whereas SH2 bassically goes "oh yeah you can like, give it zio, poisoma, and a random smattering of stat buff and debuff spells, and thats it."

[TotemMX]

Mitama Fusion, maybe. It will let you add skills and stats to your Demon.
The answer to your problem is unlocking better Special Fusions, since the high level Demons are available for recruit in the last part of the game.

[Rangoric]

Oh, by default it will fuse the base version of the demons, not the grown version. When doing the "Search Fusion" there is a setting that defaults to "Base", change that to "Registered", and you will get better results. Especially if you've been registering demons.