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I speak some German (but you should probably run these suggestions by a native speaker!) and my first thoughts are "Feuerchen" (little fire) and "Flämmchen" (little flame). From a quick search on translation sites, "Flämmchen" seems more metaphorical, so might be a good pick. I think it sounds pretty cute too.

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I think you'll generally be after fire-related words with the diminutive -chen suffix. "Fünkchen" for example means "little spark" and is also used in the equivalent expression for "a spark/glimmer of hope".

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Hope this helps :)