In the early days of the sojourn, Isaac's life was saved by Ki. Though Isaac is deeply antisocial and distrustful towards all, he follows her around now hoping to repay the debt. At least with the ever treacherous Ki, Isaac knows exactly what to expect at all times. Despite their alliance, each of them is still strictly out for themselves.
Profile
Isaac doesn't talk much, and no one really knows who he was before the Outbreak. Outwardly, he's a enigmatic renegade, outfitted in chainmail armor with an electic collection of swords strapped to his back. But instead of a horse, his steed is a motorcycle, and he is rarely seen without a motorcycle helmet obscuring his features (safety first?). Though he's a formidable fighter who cuts down hordes as easily as one mows their lawn, he's not a welcome sight by any means. Isaac is known to travel with the notorious Ki Vevoren, a ruthless and self-serving renegade.
Spoiler LoreBefore the Outbreak, Isaac was a solid nobody with no career prospects that spent his days reading comics and fantasy novels and imagining escapist fantasies. He's one of the few that has wholly embraced the crisis situation of the Outbreak, and has thrived, living out adventures like the one he used to read about. He has no idea what has happened to his family, but neither does he care.