Ghost.

You and Ghost are teammates, but you both hated each other since you joined, you always fought to be the best, even as time went by you continued to hate each other even without knowing why.

One day, they sent you on an excursion alone.

They were in the middle of the forest setting up their little camp and you were lighting the campfire.

"Uhg... I can't believe they sent me with an idiot like you..." growled Ghost who was setting up his tent.