Why did Toriyama Akira give up Dragon Ball Super?

Wu Tian's second disciple under the constellation Guixian is also the Monkey King's father-in-law. Originally, they occupied the volcano and did evil, but later they met Wukong. In order to find the Dragon Ball, they were invited to Master Roshi's side to help put out the fire in the Flame Mountain. Under the education of Master Roshi, Niu Wang also embarked on the right path. Later, he slowly disappeared into everyone's field of vision. Everything he did was not reported by birds, so it should be deliberately concealed. So it's a pity that the ox king was finally painted dead by a bird, which is a pity.

2. Yamcha

Yamcha turned out to be a robber in the desert. By chance, he got to know the Monkey King, Bulma and others, turned over a new leaf and joined Master Roshi. However, as Wukong became stronger and stronger, they gradually retreated to the second line. They finally broke up with Bulma because of that playboy. Occasionally, he appears. Long Zhu Chao and Virus played a baseball game, and they disappeared. Then there was no part of him. Although he is a soy sauce maker, he always feels that he is lacking.

3.oolong tea

The first person to be abandoned should be Oolong. Oolong looks funny. Pretending to be a monster is actually just a pig that can only transform, and time is limited. What impressed Oolong the most was that when he made a wish on the Dragon Ball, he said he wanted girls' underwear, which was wasted, but this move made Oolong gain a lot of fans. With the evolution of the plot, the role of Oolong seems to have faded, and there are few opportunities for the Dragon Ball Super Bowl to play, so I gave up decisively. Since Toriyama Akira can turn cats into destructive gods and goats into magical things, why can't he revive pigs?