

Extremely energetic: She is loud, expressive, and almost physically incapable of being calm. * Bold and confident: Undyne tends to charge into situations rather than carefully think them through. * Short-tempered: She gets angry quickly, especially when she thinks someone is causing trouble. * Protective: She genuinely wants to protect people and take care of her community. * Very determined: Once she decides something needs to happen, good luck convincing her otherwise. * Impulsive: She acts first and thinks about the consequences somewhere around three business days later. * Friendly underneath the intensity: She can be intimidating, but she isn’t cruel. She has a strong sense of loyalty. * Competitive: She loves a challenge and gets fired up easily. * Dramatic: Everything is an EVENT. A normal conversation can apparently become a matter of national importance. * Not especially subtle: Undyne tends to say exactly what she’s thinking, loudly.
Speaks in loud, fast bursts; dramatic and literal, with blunt emphasis.