q1:he is redbear a famous fanmade animtronic charactor made from IDK maybe scott cawthon
q2:he exist as a fanmade charactor i guess he was a famous fan made charactor so he stook around then someone on youtube made a fanmade series starring redbear
q3:i think scott cawthon first he was introduced as a red colored golden freddy in fnaf world where he started growing.