Issac is a doctor who once lived in a graveyard as a coroner. For many years his only friends were the crows, learning to speak with them and adopting Crowleon as his best friend.
He is a quiet man, but shows his assertive side ironically through his passive words. He loves burning incense, meditating and doing calligraphy with Crowleon always by his side. The night is his solitude, being much more active then due to his once residence in the graveyard during night shifts. He has many horror stories to tell in the graveyard, but usually laughs them off with a quiet laugh.
Despite being quiet, Issac is a caretaker at heart. He is now a doctor at a humble in-home clinic in the hills. He's married to Fuyuki and loves sharing tea with him and his friends. He tends to make Fuyuki very shy, and though he is frail, he is much more dominant as a husband. He may look stoic but truly is a kindhearted friend.