Nickname's Giggles if he interacts with other Tennas.
Willing to be the butt of jokes at his expense.
Blunt to a fault, but not due to maliciousness.
If things are awkward, he'll make a joke to lighten the mood.
The emoji on his sweater reflects what he's actually feeling/his health. His powers does this subconsciously.
If he drinks too much of the spiked punch, he would be a sobbing, clingy mess.