CORE! Frisk is a fickle, enigmatic child who is unable to mentally grow despite their nigh-infinite knowledge and wisdom. They appear to have strong personal philosophies about the good and the bad that on the surface don't always seem to make sense. Even though Frisk is incredibly open-minded, somewhere deep down they believe no one understands things better than they do and may subtly treat everyone as such. This behavior tends to amplify the more they dislike someone. It appears the Frisk suffers from PTSD, much of which was formed from the horrible experience they gone through during the War on the Surface. Sirens, Firearms, Explosions, and planes may cause them to break down or go into a panic attack. While it’s unknown if they adopted the mindset from the horrors of war or from the kindness of their birth mother, they have a belief that all lives (regardless of their beliefs, purposes, or impact on those around them) have value and rejects the notion of killing for the “greater good”. This philosophy was so strong that they viewed the need for Killing to be an artificial construct and serve no purpose other than to create misery across the multiverse.