Chartchai Coleman serves as the communications chief aboard the Valiant, a support vessel for the anti-Earth Federation organization Mafty in Mobile Suit Gundam Hathaway: The Sorcery of Nymph Circe. He is one of the veteran members of the Valiant's crew, indicating a significant level of experience and likely a long-standing commitment to the organization's cause. When operating the radio equipment, he is known to wear the same type of work cap as the ship's mechanics.

As a member of Mafty, his role is directly tied to supporting the organization's terrorist activities against the Earth Federation government. The casting for the character was announced in November 2025, alongside several other new Mafty members and characters making their first appearance in this installment of the story.

No information is available regarding his personal background before joining Mafty, his specific personality traits, his personal motivations for joining the organization, his key relationships with other characters, any character development he undergoes, or any notable abilities he possesses beyond his role as a communications officer.