The Blue-Eyes White Dragon is an engine of destruction, according to the card.
Clearly that means one of her favorite hobbies is breaking shit.
… Right?
.
Out of all the Kaiba Estate's residents, permanent or otherwise, the only one worse at handling boredom than Seto was Kisara. Seto rarely allowed himself to settle down long enough to get bored, which ultimately ended up being a maladaptive practice. But then, Seto Kaiba was little else but maladaptive practices. Kisara, in something that might have been an attempt at a healthier approach to living, quite often ended up restless and anxious for lack of something to do; and much like a cat at midnight, she would spend such periods entirely too hyper and destructive for her own good.
Mokuba, ever the problem solver of the family, kept a list of projects on hand that called for Kisara's sheer strength; and, sometimes, her ability to call on lightning. Sometimes both. Whenever it seemed like she was about to start kicking through walls or jumping out of windows just to feel something, Mokuba would mention this activity or that, and it would just so happen to coincide with something the estate needed done.
Kisara was particularly fond of "pruning" dead trees, which typically involved ripping them straight out of the earth; or "renovating" various spaces, which would involve tearing walls down.
"Mokuba is going places," Seto mused once, watching as his brother expertly guided Kisara's most destructive impulses at the back gardens. "If I didn't know any better, I'd call him a genius or something."
Roland Ackerman, Kisara's direct superior as Seto's chief of security, watched with something close to religious awe. "That boy," he said, "is going to change the world. I don't know how, and I don't know when, but I hope I live long enough to see what it looks like when he's done."
Seto nodded.
People called him a genius, especially in magazine spreads or to butter him up in interviews, but Seto didn't think of himself in conjunction with that word; he thought of his brother. Sure, Seto understood machines; he could build things, and he could build them well. But machines had singular solutions. Engineering was a science, and all it required was working out the solution. Seto was good at puzzles, he'd always been good at puzzles, but he thought that what Mokuba did was far more impressive.
People weren't puzzles.
People had too many variables. People had facets and nuances and there were entirely too many ways to approach a problem when humans were involved, and Seto had never been able to predict their outcomes to any kind of satisfaction. But this never stopped Mokuba. Mokuba never once hesitated to work out how another person worked, and how to turn that to his advantage. He didn't always use his understanding of human nature toward his own ends, but that didn't mean he couldn't.
"I haven't grounded him in three years," Seto said, more to himself than to Roland, "because it turns out that trying to work out the specific wording to ensure he actually follows the spirit of the punishment is harder and more complicated than debating with a literal monkey's paw."
Roland laughed. "I don't have any trouble believing that, sir. I don't envy you."
"When I'm bored, I build things," Seto said. "When Kisara is bored, she breaks things. When Mokuba is bored, he schemes."