Inventor of Super-Toast
All of the above sounds good. Perhaps their affinity for monsters gives them wild empathy, which they can use without penalty on magical beasts?
They enjoy the soft rays of the moon but are blinded by the sun.
The Oh-do-was are armed with either short bow and dagger (60%) or spear (40%). For every five Oh-do-was in a band there will be one magic-user (roll d6 for level: 1-2 = 4th, 3-5 = 5th, 6 = 6th). For every 15 encountered there will be an additional magic-user of 8th (roll of 1-4) or 9th (roll of 5-6) level. If there are over 25 in a band, their leader will be a 12th level magic-user. There is a 5% chance per level for each magic-user that the individual will have a usable magic item.