ANOTHER Ninjago head canon that live by is during the older seasons Jay would try to keep his hair kept and neat but the more he used his elemental powers the more staticky it would get making it more fluffier (idk how hair works but just work with me here) and after every mission he’d fix it. Eventually he just gave up trying to keep it neat and it became the way it is in the newer seasons
I know a lot of people are saying that Kai and Nya had a babysitter and whatever, but guess what.. who cares? Allow me to explain:
A Babysitter is someone who comes for a short amount of time to take care of kids. A babysitter needs money. This ‘babysitter’ definitely had her own family and I don’t think a random stranger or even if the babysitter was a good neighbor would raise someone else’s kids and provide for them and support them and love them for free. She most likely came in only to feed them, and left. Or left the minute Kai turned ten. Maybe she gave up when no more money was coming her way, and she only came to feed them for a year and that’s it. We don’t even have enough information to conclude any of this, especially not if she was a good, loving babysitter, which she was likely not. Because if she was, Kai and Nya would be mentally healthier.
When kids are growing, they look up to their parents, because they are emotionally connected with them. Kids mimic emotions from their parents, and look up at them for validation of their own. Nya was really young when Maya and Ray were captured. Kai was very young too, but old enough to know what love is because he most likely remembered his parents loving him. Now on the other hand Nya probably had little to no memory recall of her parents at all, much less the idea of what ‘love’ is.
When Maya and Ray were captured Kai was the only person left who Nya was emotionally connected with. Kai was the only person who could fill the role of being a loving person in her life, someone she could relay on and trust with vulnerability. I don’t think some children would just suddenly trust a random adult in their life, especially not Kai (remember how hesitant and suspicious he was when he first saw Wu). 
If this babysitter was that awesome, dependable, or trustworthy, Kai would not have trust issues, Nya would not need to feel independent, etc etc. Again, Both siblings would have a little more healthier mindsets.
Kai, as a child, loved Nya since the beginning. When Maya and Ray disappeared, he did raise her. You could interpret this sentence in many ways- raised her by love, raised her emotionally, raised her by providing for them both, raised her by protecting her. I strongly believe in every one of these and more, but this furthers on to my point: babysitter or no babysitter, at the end of the day, Kai did raise Nya. And I think for a small child who was just as lost and scared, he did his very best.
A child forms their idea of love normally by looking at their parents relationship, and by observing how parents treat them. Kai had a slight foundation in this already, since he loved Nya since the beginning. Nya however, as I mentioned before, likely had little to no memories of her parents. So, everything Nya learned about love, how to love, etc was from Kai. And with this, Nya had understood and developed her own love languages, and proceeded to use what she learned from Kai and reciprocate it. This was undoubtedly Kai’s biggest mental support during his childhood. And with what she learned from Kai, she started to also love Jay.
AND I AGREE?? WE HAVE THE SAME THOUGHT PROCESS I LOVE YOU VERY MUCH MITZLE
and again, adding to all of this, it’s also sometimes easy to forget that ninjago is a kids show- which is exactly what angers me more. Kids should be shown romantic relationships are important; there is nothing wrong with that. However hundreds of kids could relate to a sibling relationship, and could maybe even learn from Kai and Nya, and get closer to their own siblings! When I was younger I looked up to Kai, because he was an older sibling and I could relate to that. Other kids could do the exact same!
The writers have indeed diminished the value of Kai and Nya’s relationship, overlooking it and portraying to so many kids that romance reigns over family every time. I just wish they would change, because Kai and Nya are siblings and downgrading the important value of sibling relationships seems to be the writers ultimate goal. And honestly? This really needs to stop.
Respectfully, some of you in the ninjago fandom REALLY need to get this in your ears:
the amount of grief jay felt about nya’s death IS NOT LARGER THAN THE AMOUNT OF GRIEF KAI FELT.
familial love and romantic love are two different things. and yes, depending on circumstances and the people themselves, one can be stronger than the other.
BUT NOT IN NYA’S CASE. KAI AND JAY LOVE NYA EQUALLY. JAY DID NOT MISS NYA MORE THAN KAI. KAI JUST HID HIS GRIEF, AND MAYBE IS COPING IN A DIFFERENT WAY. KAI AND JAY ARE DIFFERENT PEOPLE. BUT THEY LOVE NYA EQUALLY.
so stop saying jay was more upset over nya’s death when kai literally held her when she was a child and raised her and was there for nya her entire life. nya missed them both, and they both missed her. thats it.