Side A mysteriously goes missing one day and everyone gets worried. A few days later, side B turns up with a robot to replace Side A. Little does everyone know that side B actually kidnapped side A and turned them into the robot

Option 1: Side C realises something fishy is going on and tries to get to the bottom of it

Option 2: Side A keeps glitching and the others find out the truth

Option 3: Side C gets mad at side A, thinking they are a robot to replace side A and can't feel emotions. Side C just wants side A back

Can be platonic or romantic