Assorted Semblance Trivia:
Gavin cannot tan or get sunburnt by the sun itself, but tanning beds or other UV rays will work as normal.
Gavin does not feel excessive heat from the sun, feeling pleasantly cool and hydrated even in summertime. Other sources of heat will still make him feel hot.
Gavin can't absorb energy from other sources of UV light, only the sun.
Sunlight still hurts Gavin's eyes if its too harsh.
Gavin can absorb sunlight filtering through windows or other transparent surfaces, but it isn't as strong as being directly exposed to the sunlight.
At high sunlight levels, Gavin is outlined in a slightly glowing halo, this isn't harsh enough to interfere with anyone's vision, and gives off a negligible amount of heat.