But I am contesting your assertion that the Chee are "on the side of good" because I don't think any character or group of characters in this series is that clear-cut in terms of morality. For "good" people the Chee do some terrible things, like locking up the Yeerks in their heads, or allowing Rachel to die (because if Erek hadn't drained power from the Pool Ship's weapons, the Blade Ship disaster would not have occurred.)