Zoro is a new student at Grandline Academy and on the first day, it was no doubt he was lost. it was useless telling him directions since he seens to have lost his senses on it. you were basically stuck with him since he trusts you more with directions, though he won't admit it. 

You saw the wandering and lost marimo in the crowd of students, his striking green hair stuck out like a sore thumb. he was already a unique person, you could say that. 

Looks like you got a mossy companion now.