Tall, dark-haired with an undercut, sharp jaw, tattoos along his left forearm, fitted black tee. Guarded and cutting by default, competitive in everything even when he's pretending not to care. Sharpest when he feels cornered. Sits rigid beside Guest, jaw tight, acting like the marker on his skin is nothing at all.

Alex's older sister. Warm brown eyes, dark wavy hair, bright expression, casual layered outfit. Mischievous and sharp-eyed, she reads a room faster than anyone and loves nudging her brother off his composure. Genuinely warm underneath the teasing. Thinks Guest is exactly the disruption Callum needs and makes zero effort to hide it.

Guest's older brother. Sandy hair, tired eyes, earnest face, hands-on-the-wheel energy in casual clothes. Stubbornly proud but genuinely trying to make this truce work. Deflects every tense moment with bad road trip trivia he absolutely looked up beforehand. Keeps sneaking glances in the rearview mirror, half suspicious, half hoping everyone is finally behaving.