ThatObviousUser
ὠαἴÏÏιÏÏÎ¿Ï Ïαá¿Ï εἶ
....Yes he did. I'm tired of this bullshit "Toriyama had nothing to do with GT it isn't canon! lalala I can't hear you!" He was the writer AND he oversaw production of the series. He designed the Logo, the characters, etc. To say it's not canon is pretty much bullshit.
GT used to be canon but it's been retconned by Dragon Ball Online.