D&D Monster Maker

Type (d14)
1	Aberration: totally alien mindset, like Slaadi and Beholders
2	Beast: a simple animal
3	Celestial: higher entities from higher planes, like Angels
4	Constructs: made, not born, like animated items
5	Dragon: though they can true dragons, they're probably a distant relative
6	Elementals: born of the elemental plane, gifted with elemental powers
7	Fey: a magic creature, tied to nature, like pixies or elves
8	Fiends: a demon by any other name
9	Giants: Giant humanoids, like it says on the tin
10	Humanoids: like us, if only in form, look to the goblinoids for insperation
11	Monstorsity: those who don't fit into the other caragories
12	Ooze: Gooey and shapeless, once more like it says on the tin
13	Plants: feed me Seymour. Like at blights and the shambling mass for inspiration
14	Undead: dead is better. this should be rather obvious

Roll 4d6 6 times, to determine it's stats

Good-Evil Alignment (d4)
1	Good
2	Neutral
3	Evil
4	Any

Lawful-Chaotic Alignment (d4)
1	Lawful
2	Neutral
3	Chaotic
4	Any

Size (d6)
1	Tiny (imp, sprite)
2	Small (giant rat, goblin)
3	Medium (orc, werewolf)
4	Large (hippogriff, ogre)
5	Huge (fire giant, treant) (may be taken instantly if giant type)
6	Gargantuan (purple worm, Kraken) (may be taken instantly if giant type)