I was in the process of writing my novel (finished it and did a bad job on it actually and realized (as per someone's suggestion) it makes a better outline so I know where the story is going and what mistakes not to make) when I realized that perhaps the best opportunity to flesh out the MC would be to show him as when he was a child. The wheels began to turn and I came up with an idea for a story in his youth (also, he's not human, his people are more akin to animals). The basic premise is that a baby gets kidnapped from his village (he's eight, two of his accompanying friends are also eight, an older slightly overbearing child is ten and his sister who was NOT supposed to have been brought but was brought anyway is two), and him and his friends rush to get the culprit (a fairy) and get the kid back. The boy was always intended to be brave and impetuous (and unwise), the other boy with him a bit of a crybaby, the girl his age for whom I don't have much description for other than 'not cowardly', the older girl overbearing but slightly wiser too (and the younger sister at age two is really of little consequence). Very basic personalities and I don't see room for growth at their age to be honest (also, aside from the older girl, they're all pretty impetuous). I'm avoiding dark themes like racism, betrayal, war, murder and child abuse (THOSE are coming in the stories afterwards, heheh). The crybaby is the only one I can see with some room for growth, the two girls (three technically if you include the two year old) are actually supposed to also be brave because the females of their species are naturally aggressive. My main question is, is it bad to write a story where the characters don't grow? Where they're going essentially on an adventure through old ruins and encountering fairies and other such? Is a lack of character development going to seriously harm the story?