Um, let's see. Some basic ones...
- Because of the way their head is, they can't really eat. And they really don't need to since the Golden Bough in their prosthetic head takes care of their body's needs and keeps them up and going. Though they could theoretically ingest something through a tube in their esophagus, they tend to find it unpleasant and so avoid it. But they will hold food when with others and let someone else eat it just to feel included.
- Because of the above reasons they don't really need to breathe also.
- Deal with some chronic/phantom pain issues due to all the rewinds. Especially if they've had to rewind the Sinners several times in a single day.
- The flames on their head react to the proximity of hands/other objects getting close and reduce if something comes too near. So they don't accidentally burn other people or objects by standing near them. But if you held your hands a certain distance away you'd feel the heat coming off of it. But if you're fast enough you could theoretically light something off of the flames. The flames are nonreactive to combustibles/accelerants like gasoline.