Princess Solaris Concordia Acanthus, or Miss ‘‘Sally Acorn’ on the streets, because Robotnik’s heard that there is at least one remaining member of the Acanthus dynasty he didn’t manage to hang in their own courtyard after his coup, and by god he’ll suss them out if it’s the last thing he does.

Sol’s led an extremely rough life since she and her ‘betrothed’, Aurelien ‘Antoine’ D’Coolette went into hiding after the death of her parents and the betrayal of the royal family by his father (the former war general), and growing up with everyday folk fighting to survive the colonisation, and the heroes of Mobius’ independence movement, has given her an insight to her people very few in her dynasty have ever had.

Calm, analytical, level-headed and a charismatic speaker, she’s almost entirely business with what seems like the weight of the world on her shoulders and functions mainly as the strategist and chief of intelligence for the team. However, she has the ability to Ironman Up when she uses the Power Ring to augment and combine with Nicole (her Jarvis A.I which was set up by Charles the Hedgehog as a caretaker of sorts when her parents unfortunately began to sideline her for their newborn son/the crown prince).
As close as she is with Antoine and much as she adores him as her best friend, her only friend outside of Nicole for a long time (as children they very vaguely understood what exactly their parents had planned for them), she has no romantic interest in him and they eventually amicably call off the feudal arrangement (she’s extremely happy for him and Bunnie!) in choosing to continue loving each other platonically as BFFS.

She had long hair, but used little Antoine’s sword to do a Mulan on herself as a child so they could both escape into the underground together as Nobodies, and hasn’t really grown it out since for practical purposes (and because she thinks she needs to fit this All Business aesthetic, though Bunnie eventually encourage her to literally let her hair down).
Still struggling with her trauma and grief deep down, which she has a tendency to bottle up for the sake of everyone around her, and it’s Sonic who makes her realize eventually fixing her dynasty’s mistakes isn’t a burden she has to carry by her own, and that this fight isn’t hers alone as the purported living embodiment of Mobius’ enduring legacy.