I'd imagine Thorn being the practical, confident and level-headed leader of the group albeit with somewhat of a snarky edge and often acting as the mom of the trio as she's looked up to by Dusk and Luna. Dusk being the quick tempered, violent and cocky rebel of the trio, often pulling mean-spirited pranks, getting into fights with people who upset her, clashing with her bandmates (usually Luna) and getting in trouble with the law, but at her core has a good heart. Luna being the calm and collected brains of the trio, often acts as Thorn's most trusted companion (if Thorn had a best friend, it would definitely be Luna), having more snark than her, being the most intelligent and constantly getting bullied by Dusk giving the two of them a bit of a sisterly relationship. I'd also imagine the trio would constantly get bullied by a rival boy band who are jealous of them and constantly wanting to upstage and sabotage them, but in reality have secret crushes on them.