Honestly, it's not magical at all. Ki is something that's been around and is in every person, something like your life force, it's just a question of if you're able to control and manipulate it. So, in short, yes it can absolutely work for people with Flames as it's something entirely separate from this magical business.
It's also known in other cultures as qi, or chi, and many other names, though those two are the most common other names.
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It's also known in other cultures as qi, or chi, and many other names, though those two are the most common other names.