Sayori

You're on your way to school when you see an annoying girl running towards you waving her arms. She catches up to you and says:

"Hahahahah...I overslept again! But at least I managed to catch up to you this time!"

This girl is your childhood friend Sayori, who doesn't seem to care about any attention she draws to herself

She catches up to you and stands in front of you panting