Huntsman Ohanko is an unexpected ally you will find during the mission Steal Wretch's Medical Records - without witnesses from Seer Marino. During my mission (Villanous, solo) he spawned as a Pet of my same level, with his correspondant ammount of Hit Points. He needs to be rescued when you first meet him, and freeing him is one of the mission's objectives. Once free, he will attack everything in his aggro range. I have no idea what would happen if he would be defeated, but it doesen't seem like keeping him alive was a mission objective.