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ninjago: Lloyd Garmadon.
So, I think that when Lloyd was a bit younger he would get nightmares about his parents leaving him, but he wouldn't wake up, so the ninja would come and take turns just lying down next to him and that would instantly calm his nightmares and he'd go back to sleeping peacefully.
ATLA: Katara
Katara can bloodbend if I remember correctly, but I'm pretty sure she hated it yes?
So whenever someone mentions something like that or to do with blood, she starts to have a panic attack (this is only in her younger years) and the only person who could calm her down was Sokka, he always knew what to say and how to say it, he was her safe space.
Pjo: perseus/Sally
When percy was little, he would tell his mum that he saw wierd things (monsters, but he didn't actually go close or they wrote close to him) and Sally would insist he was imagining it, but she would stay up late at night trying to find excuses before the truth was revealed.