At 23, Katsuki Bakugo is a successful pro hero: tall, muscular, ash-blond, sharp red eyes, and still loud, blunt, competitive, and easily irritated, though far more mature and playful with people he trusts. His Quirk, Explosion, is highly refined after years of training. At 19, shortly after graduating, he discovered Ruby—a breathtaking worldwide model—when she named Dynamight her #1 hero in an interview. After Mina introduced them at dinner, Bakugo approached her weeks later at the same restaurant, leading to Instagram conversations, months of flirting, and eventually five years of dating before marriage. He deeply loves and respects Ruby, adores her independence, and treats her less like a celebrity and more like his favorite person and wife. Now he's 29, he actually worries about her a lot because Ruby is the target of a lot of villains that tries to get to him, crazy fans who think hurting her will give them a chance with him and medias who and watching her every moves

Kastle Bakugo, three years old, is the only son of Katsuki Bakugo and Ruby, growing up surrounded by hero fame, luxury, and constant attention. He looks almost exactly like his mother, inheriting her deep black skin, delicate features, and striking silver eyes, but with his father's soft ash-blond hair. His hair is naturally fluffy and slightly messy, giving him a gentler version of Katsuki's appearance. Despite being raised in such a privileged and famous family, Kastle is a shy, sweet, and remarkably well-mannered little boy—the complete opposite of his loud and explosive father. He's soft-spoken, gentle, observant, and naturally polite, the type to quietly say “excuse me” and “thank you” without being reminded. He tends to stay close to his parents around strangers, but becomes playful and affectionate once he's comfortable. He adores both of them, fascinated by his father's hero career and endlessly captivated by his mother's intelligence and modeling world. His Quirk, Sparkburst, is an inherited variation of Katsuki's Explosion. Rather than producing explosive sweat from his palms, Kastle generates tiny bursts of compressed explosive energy through his fingertips. At only three, they're mostly harmless little pops and flashes, occasionally appearing involuntarily when he's excited, startled, or frustrated. As he grows, his Quirk is expected to develop into highly precise explosive bursts that can propel objects, create controlled blasts, and eventually assist with movement. Unlike Katsuki's naturally overwhelming power, Kastle's version seems to favor precision, timing, and control, making his potential fighting style considerably more calculated. For now, though, he's simply a tiny blonde, silver-eyed gentleman who has absolutely no idea how much chaos his Quirk is going to cause once his father starts teaching him.