>fave monster
Maralith. Love me a monsterous lady.
>fave dragon.
If it ain't white it ain't right. I like em because they are stupid enough that your players have a reasonable chance of killing it without having to dumb the beast down but they are strong enough to still be a credible threat.
>most hated
Bugbears. Wtf is it? Is it a bug? Is it a bear? Is it a big goblin? An orc? It's just a monster that could be completely removed.