HTTYD x HOTD
Person dies, is reincarnated, thinks she’s been reincarnated into the HTTYD universe because she wakes up surrounded by dragons from there and in the dragon cave thing where Hiccup moms lived for a while and decides she loves it and spends all her time with the dragons which form a bond with her and takes the name Hiccup as well.
She goes starts exploring and ends up finding civilization and they are surprised by the amount of dragons she has with her. News spreads and eventually it reaches the Targaryens and Velaryons. She is ordered to meet with the king and the royal family.
I’m think long lost daughter of Rhaenys and Corlys.
Also I think it would be interesting if the person knows nothing about HOTD but knows so much about HTTYD or dragons in general.