Ships that are allowed:

Jelsa.
Hiccstrid.
Kristanna.
Eugunzel.
Klance.
Shadam (alive Adam).
Jaya.
Kailor.
Pixane.
Hugfia.
Adrienette.
Lukanette.
Julerose.
Marcaniel.
Feligami.
Cindercharming.
Philora.
Jaladdin.
Pepprony
Hiccanna.
Hiccelsa.
Hijack.
Hiccunzel.
Mericcup.
Jarida.

Ships that are not allowed:

Cedfia. (I view Cedric and Sofia as father-daughter. I don't know who came up with this ship)
Polyninja (this ship ruins Kai, Cole, Jay and Zane's brotherly relationship. I prefer them brothers, along with Lloyd).
Elsanna.
Hidashi.
Thorki.
Hirogo.
Stucky.
T-cest. (TMNT incest).
Cluke (I see Clementine and Luke as brother-sister).
Click (same with Luke and Clementine, I see Clementine and Nick as brother-sister).
Iarley. (It's the incest ship of Ian and Barley)