Nega and Posi or Plus and Minus are Pegasus twin fillies. Born from the same mother and father at the same time but are polar opposites.
Plus is sill, goofy and flirty with colts and very very loving of her opposite. Her cutie mark is the plus sign.
Minus is uptight, serious and straight to the point. Focusing more on the negative mor than than the positive. Her cutie mark is the minus sign.
Being as they are twins, each share the same color co-ordination. A coat of air-plane grey and a mane of black with green highlights, accompanied by a bow.
Neither of them have ever hugged eachother because if they do, they will short circuit for temporary amount of time. This is a birth defect.