Yes, they are just friends. Of course some fans are free to ship some Skylanders, but that doesn't make the shipping really official.
Also you can't go telling others that their shipping is wrong. It's their opinion after all if they want to pair Skylanders other than what you suggested. It could get you in trouble, if you are lashing out at them for not sharing your opinions.
And Flameslinger and Stealth Elf, Hex and Ghost Roaster are not siblings, that's false.
Pop Fizz is my favorite skylander in skylanders giants I had him on wednesday when I got home from school he is so much fun! He makes me happy! lol!... He is specail! He is like one star! He is like some happiness!