The way my comics mana/ether system works is kinda mirrored, or at the least loosely inspired, by a few other games/stories/worlds
One of the main inspirations is Unison League's ether system. Overall it serves as a life force and even contains the essence of the soul, as the games story seems to suggest. Every person is born with varying amounts of ether but through various means have the ability to gain more whether by training or taking it from elsewhere (like other people, monsters or gems). Uses for ether go from the basics like magic, as a boon to weapons in the form of weapon abilities and to perform "miracles" like summoning, healing, and bigger magic stuff. It's also harnessed and used in tools (similar to how mako is used in the final fantasy games) like commstones, as currency (in a condensed form such as gems, ether drops and gem fragments) and can be traced but similar to signal waves in the real world can be interrupted or masked.
There's also loose inspiration from the Sonic series and how it addresses chaos as it's something of a life force but more an energy or power. One thing in particular being that it flows freely everywhere but also exist in it's condensed/physical forms, manifested through the chaos emeralds, master emeralds and afaik rings too. It has the ability to be replicated (albeit not perfectly) as well as being corrupted (one example being in sonic unleashed when dark gaia is released). One quirk (which is similar to other fantasy setting stories) is that the key physical forms, being the chaos emeralds and master emerald, are connected so if the chaos emeralds loose their power the master emerald (which controls them) also looses power and vice versa where if the master emerald looses it's power the chaos emeralds become more volatile and unstable.
When it comes to creating your own magic systems especially when it comes to what your planning with mana the main thing is going to be answering questions like where does it come from, is it an unlimited resource or is there only a specific amount that's drying up/running out, what is it's worth and so on. As the creator you have complete control so there's no harm exploring things to figure out what best works for your story.