Let's dive into some headcanons on how the characters from Dragon Ball Z, Super, and Legends might react to discovering Aqua's decade-long ordeal in the Realm of Darkness:

Heroes:

Goku: Goku would be both shocked and deeply moved by Aqua's resilience. He would immediately feel a strong sense of duty to help her, inspired by her courage. Goku would be eager to challenge the darkness itself, viewing it as an opportunity to test his strength and help a new friend.

Vegeta: Vegeta would be impressed by Aqua's endurance but would mask his concern with a gruff exterior. He would see rescuing Aqua as a way to prove his superiority, both to himself and to any potential threats lurking in the darkness.

Gohan: Gohan's empathetic nature would make him deeply concerned for Aqua. He would be determined to assist in any way possible, driven by a strong moral conviction to help those in need. His scholarly background might even lead him to research ways to counter the Realm of Darkness.

Trunks: Having faced dystopian futures himself, Trunks would empathize with Aqua's struggle. He'd be particularly motivated to save her, seeing her as a kindred spirit. Trunks would likely strategize a detailed rescue plan, using both his fighting skills and intellect.

Bulma: Bulma would take a keen interest in the technology and magic behind the Realm of Darkness. She would be instrumental in creating devices or strategies to help rescue Aqua. Her ingenuity would be pivotal in navigating the unknown dangers.

Piccolo: Piccolo would respect Aqua's strength and resilience. He would approach the situation with calm determination, focusing on the strategic aspects of the rescue. His mentorship role might also lead him to offer guidance and support to Aqua once she's rescued.

Beerus: Beerus would be intrigued by the challenge of the Realm of Darkness. His involvement would hinge on whether he finds the situation entertaining or beneficial to his interests. Whis would likely influence him towards helping Aqua out of a sense of cosmic balance.

Whis: Whis would approach the situation with his usual calm demeanor. He'd be interested in Aqua's experiences and might assist out of curiosity and the potential knowledge to be gained. Whis would see the value in restoring balance and helping those in distress.

Cabba: Cabba would be deeply empathetic, having a strong sense of justice and compassion. He would be determined to help Aqua, seeing her as a warrior in need. He might even seek help from his Universe 7 mentors to find a way to rescue her.

Caulifla: Caulifla would be outraged by the injustice of Aqua's situation. Her fiery personality would drive her to take immediate action, eager to fight anyone or anything that stands in her way to save Aqua. She'd likely see Aqua as a potential ally and would be inspired by her resilience.

Kale: Kale would initially be shocked and saddened by Aqua's plight. However, motivated by Caulifla, she would find the courage to join the rescue mission. Her protective nature would make her particularly dedicated to ensuring Aqua's safety.

Jiren: Jiren would be moved by Aqua's resilience and tenacity. While he typically fights alone, he would see the value in rescuing someone who embodies such strength of character. His dedication to justice would make him a powerful ally in the mission to save her.

Toppo: As a warrior of justice, Toppo would feel a deep moral obligation to rescue Aqua. He would rally the Pride Troopers to join the effort, emphasizing the importance of teamwork and justice in their mission.

Shallot: Shallot would be fiercely determined to help Aqua, driven by his sense of justice and camaraderie. He would see her as a fellow warrior who endured great trials, and he'd be motivated to restore her to safety.

Giblet: Giblet would respect Aqua's strength and resolve. He would view the rescue as a chance to prove his own might and to stand up against overwhelming odds. He might also see Aqua as a potential ally in future battles.

Villains:

Frieza: Frieza might see Aqua's predicament as a point of curiosity or even a twisted amusement. However, if there's something to gain from her rescue—be it power or knowledge—he might be willing to assist, albeit with ulterior motives.

Zamasu: Zamasu would view Aqua's decade-long entrapment with a mixture of disdain and curiosity. He might think that mortals, even ones as resilient as Aqua, are ultimately flawed and deserving of such suffering. However, her ability to survive in such harsh conditions would intrigue him. He might see her endurance as a sign that even mortals have a certain level of potential that could be useful in his own grand plan to purge the universe of impurity.

Goku Black: Goku Black would be both impressed and intrigued by Aqua's endurance and strength. He would see her survival as a testament to a rare kind of strength that even mortals can possess, which might make him momentarily reconsider his view of mortal beings. However, he would quickly turn this to his advantage, seeing her as a potential tool or ally in his quest for a utopian world free of mortals. If she resisted, he would relish the challenge of breaking her spirit.

Zahha: Zahha would likely be intrigued and fascinated by Aqua's situation. As a character who is often interested in mystical and dark powers, he would see Aqua's prolonged entrapment as a valuable source of knowledge and power. Her survival would signal to Zahha that she possesses remarkable strength and resilience, making her an asset worth understanding and possibly manipulating for his own goals.