How about a bat category.
Bat wings: They work like and cancel out bird and insect wings.
Blindness: You cannot see further than 1 tile without echolocation. You can only read braille books and can only use terminals that have verbal interfaces so we might as well say that this implies illiteracy until you have an OCR (optical character recognition) machine. -3 dex when walking through sharp terrain. Nearsighted and farsighted can transform into this if you have echolocation traits. Can also be a starting trait for -4 points.
Echolocation: You can see 15 squares at any time of the day, even when blind, blinded, in complete darkness, or boomered. Implies enhanced hearing. Adds 4 to sound while walking when not blind, blinded, boomered, or in a very dark place because you use audible noises for this. Can be taken as a starting trait for 4 points due to neuroplasticity.
Ultrasound echolocation: You can see 15 squares at any time of the day, even when blind, blinded, in complete darkness, or boomered. Implies enhanced hearing. Echolocation transforms into this.
Vampirism: You find blood to be appetizing with a morale bonus instead of a penalty
Other traits:
Quick, Deft, Light Step, Bad Back, Glass Jaw, Hollow Bones, High Night Vision, Extremely Dexterous, Nearsighted, Good Hearing, Disease Resistant