Here are some Ideas
Ground Monsters
witch , Remorhaz , Thri-Kreen , Ankheg , Yuan-ti , Behir , Werebear , boar , Goblin , Troll ,
Ettin , Ogre , Vampire , Ghost , Lich , Mummy , Centaur , Cyclops , Minotaur
Flying Monsters
Griffon , Chimera , Manticore , Yrthak , Harpy , Gargoyle
Hopefully you like 2 :D