Haha, I'm so glad you like this!
I hadn't mentioned the twins, but they're all in Gryffindor. With the same way only 'chiefs' have Nightmares in the HTTYD books, only chiefs go into Gryffindor... which is why there was talk of Snotlout being destined to be chief instead of Hiccup back at Berk.
(even though Snotlout wished he was in Hufflepuff some days... for Astrid
)
In my mind, these "personalized" brooms have a lot more spunk than standard brooms. Plus, there's the whole business of how Hiccup got that Night Fury scale
Besides, I'm saving the "flying a dragon in a quiddich game" for Hitchups