Coss
From ZFGCpedia
Coss is a lost poe, who did the opposite of most poes. He befriended Malakai and his friends and did what he can to help them out. Unlike other poes, Coss isn't hurt by sunlight, however, pure light seems to stun him and could probably kill him. Same can be said about darkness, for if he is shrouded in it, he can be devoured by darkness.