The alignment specified in a monster's stat block is the default. Feel free to depart from it and change a monster's alignment to suit the needs of your campaign. If you want a good-aligned green dragon or an evil storm giant, there's nothing stopping you. Some creatures can have any...
Dragon, Shadow Mimic Zombies Dragons Mind Flayer Dragon Turtle Minotaur Drider AMiscellaneous Creatures Modrons Dryad Mummies BNonplayer Characters Duergar Elementals Myconids Index of Stat Blacks Nagas Elves: Drow Nightmare Empyrean Nothic Ettercap Ogres Ettin Oni Faerie Dragon Oozes Flameskull Orcs ...