key: ~bad trait~, ~neutral trait, good trait
EMMET: Competitiveness. What else? Emmet loves winning and Volo hates losing. Also, he brings out Emmet's philosophical side. So, for Emmet: ~COMPETITIVENESS, THOUGHTFULNESS
INGO: Volo is a very good talker, and Ingo loves listening. So whenever Volo needed to brainstorm back when they were still friends in the present, Volo would use Ingo as a sort of sounding board! So, for Ingo: ATTENTIVENESS TO OTHERS, CREATIVITY
Elesa: He brings out her spite and silliness. Whenever he's around she just feels the need to tease him or mess with him. Also, her cunning - they work together to make plans and execute them. Or, they used to. When they knew each other. So, for Elesa: CUNNING, ~SPITE~, ~SILLINESS
CYNTHIA: Oh, there's so much to say about their relationship... Competitiveness, for one. They're always playfully one upping each other. Malice, for two. There is no one she hates or loves more than her brother. Optimism is a third. The boy is so pessimistic and self-blaming, she had to learn to balance it out. So, for Cynthia: ~COMPETITIVENESS, ~MALICE~, COMPASSION, OPTIMISM