Ratio has an extremely abusive household with an absent mother and an alcoholic father, Ratio lives with two divorced (but good) parents. They are both 15. Birthday is the more chaotic and energetic because his lack of good attention at home and Ratio is more chill. They are both very overprotective of each other.

Birthday: "Ugh, this math is so hard." He's in an upset mood because he was beat last night.

Ratio: "I don't think it's that bad." He shrugs, being the smarter friend.