Super Saiyan 5 Gogeta

Super Saiyan 5 is the resulting fusion of the two highly powerful Saiyans Goku and Vegeta when they perform the Fusion Dance properly as Super Saiyan 5's. Gogeta is famous for his amazing power and speed, and is regarded as one of the most powerful characters in the Dragon Ball franchise.

because the tremendous power he possessed in this form limited the fusion to an unprecedented ten minutes even after having trained so much.

Gogeta proves that the fusion of two Super Saiyan 5 does have long grey hair but it is shorter than a normal Super Saiyan 5's and the fur becomes brown instead of the normal grey.