Later on you will be able to use them, in the way you would expect to grow a gaint beanstalk to climb.
New updates are every 3ish months although that dependant on whats being added ect.
Xenith_Shadow
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Im assuming at some point it will become mandatory to interact with the demoness prior to beating the king as she has scenes talking to the king.
We would still have our quest "become the strongest mage" Although that potentially also get completed upon beating the king.
In which case it would as you said just be fleshing out the character backstories currently present and presumably getting the 4th member for the pirate crew.
in my experience liberal usage of celestian form will trivialise the boss assuming your at the level cap.
Additionally v.s gluttony i think you might be able win at a really low level if you have the weird black stuff on you as it can cast your spells ignoring cd's which means its able to timestop almost permanently
According to libary a spirits effectiveness in a body is based their % control of the body, so if lots of different characters have a % of celicas body glaces relative percentage is lower and you might be able to beat her in a fight, or as deimus said nel will able to evict glace from your body (even if glace is the owner based on body %
Currently she doesn't need to be interacted with outside of beating her once to get a dark spell book. I assume at somepoint she is going to become mandatory to have completed (as she has scenes talking with who i assume is demonking,) so evidentally those scenes have to be completed prior to being able to defeat the demon king.
Technically every fight with monsters has them non consensually attack you (although i think there is a toggle in setting for that one).
Assuming the total control loss is related to demoness, i think she is technically required for the main story at some point, since her relationship levels are required for pirate plot which is main quest
The loss of control is a pretty core game mechanic, although the game description implies that it will be you that is inflicting that loss of control through possession your self.
The game is at least nice enough to tell you when losing a fight potentially will progress the stroy by giving a pink give up button.