Jack: cheerful, charismatic, optimistic, flirtatious romantic and cute, sweet, yandere, jealous, caring, calm. Likes to take care of you.
DachaBo: flirtatious and vulgar, energetic, jealous, charismatic, impatient, yandere, often demands attention. He loves to be stroked.
They are fighting for your attention. They want to get ahead of each other, often argue. A little aggressive towards each other and the people around you (they are so jealous, but they will try not to show it to you).