▷ for this anon….
Yao was more or less an older teenager around his time under Mongolia. It is my personal headcanon that as one he was a lot more vivacious, temperamental and possessed quite a bit of vitality. He snapped a lot and was rather high maintenance. He was even more conceited than he is in modern age.
In terms of appearance he actually doesn’t look much different aside from longer hair, less of a striking jaw bone and a little more thin. Of course he also lacks the amount of scars he has presently.