On the subject of exotic pets. You need a license for any reptiles of amphibians you keep and it is illegal to pull them out of the wild. If you are going to go with something like that though, bearded dragons make excellent pets as most reptiles dont actually enjoy human company they just learn to tolerate it but beardies will actually enjoy the time spent.
No matter what bird you get, they are going to require maintainence. A seed only diet is no good for birds so you need to provide them with a variety from your kitchen as well. They also need to spend time with you daily in order to stay the tame and cuddly pet you want. They are flock animals and your family becomes thier flock.
Ferrets are about on par with a cat only if not handled properly they can nip so probably not ideal for a young child. Axolotls are not something that can be held and carried for long periods and they need cool water so if you are somewhere warm you may have trouble with this.
Basically, every animal is going to require some maintainence and if you dont love the type of animal it is then you are going to get bored quickly because your child will not be able to meet all its needs so that will be on you. Even some fish can become tame pets if enough time is spent on them. Basically, the more time and effort you put into it, the better a pet it will be.
Mum made my cat be an outdoor cat despite all my protesting and he never wanted to be cuddled or anything. Also, they are legally supposed to be locked inside at night where I live. Im not sure about the rules where you are but either way dont make a cat be purely outdoors. Ohh and one of my cats died of kidney failure due to people feeding her. She was on a very strict diet (which obviously they couldnt know about) to help her kidneys and because other people in the neighbourhood broke this diet daily her kidneys gave out.
Im going to apologise in advance if this post comes across as ranty or negative. Not my intention its just that most pets that are deemed "low maintainence" are only deeemed so because they can survive with little attention, that doesnt necessarily follow that the lack of attention is fulfilling all thier needs and making their life a good one. Fighting fish can survive in tiny tanks with no filtration or heating but it doesnt mean they like it. I put my boy in my 2ft fish tank and he came alive! He played, I trained him and he lived for like 4 yrs.
Whatever you decide on, research it extensively and make sure you can provide it quality of life not just an existence.
Sorry, am getting ranty again.