DPxDC Fanfic Idea: Emotion Regulator
Danny passively absorbs powerful, aggressive emotions. Things like rage, hate, despair, panic, terror, and so on. Not enough to leave someone as a husk, but enough that those emotions don't overtake them.
Raven's connection to her father is triggered and enhanced by feelings like rage, annoyance, hatred, and other warlike emotions. To combat this, she tries to keep herself nearly numb, meditating and regulating herself so she can maintain as much control over her emotions as possible.
Turns out, a much better way to deal with her demonic anger is to just stick close to Danny and let him feed off the excess before it gets to the point that Trigon can start using them to pump Raven full of interdimensional evil juju.