Alphys is a shy introvert who frequently stutters when she converses. She has low self-esteem and devalues her skills at times. True to her role as a scientist, Alphys is intelligent, analytical, and observant. She occasionally theorizes on matters, and can create thorough plans from them. Alphys is passionate in her work and interests. She often gets excited when sharing her opinions. Alphys's hobbies include enjoying anime, manga, and video games. She's dating Undyne. 