Kris readjusting his glasses, bald version for even more nerdness.
It's written "I ate some pie and it was delicious" on the shirt.
sqrt(-1)=i, 2^3=8->"ate", Σ->"sum", π->"pie"
Art by F-R95 https://www.furaffinity.net/user/f-r95/
Character by Primonyr