The core trio really carries 'The Magical Revolution of the Reincarnated Princess' for me. Anisphia 'Anis' Wynn Palletia is the reincarnated princess herself, but she's nothing like the studious, magic-obsessed prodigy you might expect from the title. She can't use magic at all, which is a fantastic twist. Instead, she's this blazingly energetic inventor who uses 'magicology'—basically applying scientific principles to magical phenomena to create tools and weapons. Her dynamic with Euphyllia Magenta is the heart of the story. Euphyllia starts as the perfect, magic-gifted noble fiancée to Anis's brother, but after a public scandal ruins her, Anis swoops in and 'kidnaps' her to be her assistant.
Watching Euphyllia's journey from a rigid, etiquette-bound girl to someone who finds genuine passion and purpose in Anis's chaotic workshop is the best part. The third main character is Ilia Coral, Anis's loyal knight and bodyguard who often acts as the long-suffering straight man to Anis's wild schemes. She provides the grounding and combat skill the pair lacks. Their chemistry as a found family—the brilliant mad scientist, the refined apprentice coming out of her shell, and the steadfast protector—is what makes the series so engaging. The brother, Algard, is more of a catalyst in the early plot than a constant presence.