Imagining a tough character getting beaten up by a child is amusing, at least.
However, while we're being honest with ourselves here, most of us know when we read our writing on children that it comes across weird, but for the sake of "adding that extra cuteness" or "Provoking some feeling from the innocence of a child", we cut corners and go over the top. I'll be blunt here. It's sloppy and it's bad writing.
Stupid Anime. Stupid Cookie Cutter Children, that are usually just adults in child bodies or emotional annoyances. There. I got that out of my system.) I don't hate anime. I watch it myself, but sometimes, I just have to cringe.
you have to attack mannerisms. There are, quite simply, things kids like and do not like doing. For example: children under five are very prone to tantrums. Consistently writing a child who is quiet, never complains, and always does what they are told, leads me to hope that you have some brilliant subplot about them being a robot or similar being. Otherwise, something is wrong.
The final check in the behavior of children is physical action. In a normal situation, children do not outrun cars. They don't cook three course meals on their own. They don't jump off buildings and turn out okay or lift things twice their weight. Unless your child is a superhero, in which case you can feel free to make them jump off as many buildings as your heart desires.
A Child is as Multi-Faceted as any other character. The expression of these “facets” will differ in many cases to those of an adult
Child characters are not adults
Another case of this is children being completely unfrightened by severe injury or deformity because of their innocence. Just being around other people gives the child a general template of what a healthy or well-formed person should look like. A child's survival instincts will usually steer them away from anyone who does not fit the template. These instincts are so powerful that some small children are terrified by even small deviances from the template - some have been known to cry in terror when someone puts on a hat or a pair of glasses.
Sometimes a child will be portrayed as intelligent enough to pull off a relatively sophisticated con or prank, yet can't figure out why their victim would be angry or upset about it. To pull off a con of any kind requires you to have a relatively good comprehension of human behavior. Furthermore, the whole point of a con (eg, tricking little Sally into turning loose of her dolly) is getting someone to do something they would never do under other circumstances.
Children who are completely fearless in their ignorance and innocence, blissfully frocking into situations where grown adults would wet their pants in terror. This is Hogwash. Children are just as fearful as adults are, if not more, because they haven't learned the not everything that makes a loud or strange noise, or crawls out from under the bed, won't hurt them. Although children are more impulsive and get get themselves into more danger than adults, they still have survival instincts.
As a last note, writing completely from a child’s point of view can rob the work of necessary perspective.
Try to allow for adult exposition etc. (for example, have my narrator looking back from a future place, slipping the odd insight in here and there — though there are other methods.)
My youngest characters I'd probably play as would be around 8 to 12 where it's more reasonable if they are an awesome prodigy they can still kick some butt.
So your basically saying i should remove the demon if i want people to fight her?
Mmm well would you say Scylla (an ancient beast) is a good example or bad example of what you are saying is unnexceptable?
Okay hm im in quite a ruck here, i need to find a way to make it realist for a child or 7 or so to fight grown warriors.
I think i might have it tho.
Maybe she is some kind of slave and is forced to enter tournaments by her masters, because they are too cowardly to enter themselves, and then she escapes and she continues to fight because it is the only way she knows how to make money to survive.
<Snipped quote by Bartimaeus>
If she's forced to fight, then it's already unrealistic of a child. She'd sooner throw a tantrum and get herself killed
But they tell her she will die if she doesnt fight, so she does the best she can, until she can escape via a whole in the wall that her opponent makes by missing, and she runs through it and escapes.