Danny Fenton/Danny Phantom: Danny's ghost form is built around an ice core and he technically half-died through electrocution. So lets go with mostly light blue with some stains of purple. His ghost energy is neon green, if that would show up.
Conan Edogawa/Shinichi Kudo: 100% normal human, apart from being ten years younger than he should be. No elemental affiliation. If he had a color association it would be blue.
Takato Matsuda and Guilmon: Red and gold. The colors tend to bleed between the two of them, although Takato has more of the gold and Guilmon has more of the red. The red is from Guilmon's fire affinity. Takato does not have an elemental affinity but is associated with gold.
no subject
Conan Edogawa/Shinichi Kudo: 100% normal human, apart from being ten years younger than he should be. No elemental affiliation. If he had a color association it would be blue.
Takato Matsuda and Guilmon: Red and gold. The colors tend to bleed between the two of them, although Takato has more of the gold and Guilmon has more of the red. The red is from Guilmon's fire affinity. Takato does not have an elemental affinity but is associated with gold.