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From the sound of it, you are creating what I call a catalyst character. The dictionary definitions for this term are: 1. Chemistry. a substance that causes or accelerates a chemical reaction...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/34370 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
From the sound of it, you are creating what I call a [catalyst](http://www.dictionary.com/browse/catalyst) character. The dictionary definitions for this term are: > 1. Chemistry. a substance that causes or accelerates a chemical reaction without itself being affected. > 2. something that causes activity between two or more persons or forces without itself being affected. > 3. a person or thing that precipitates an event or change: Unlike the other characters, he doesn't end up being "transformed," but your story couldn't begin without him. So give him the importance he deserves (but not more).