Is Gin Ichimaru from Bleach is a good guy?

Answer 1

Yes, gin dies. He is stabbed by aizen after his hand is ripped off. But he dies only after ichigo arrives at the scene. He sees the determination in ichigo's eyes and knows that he is capable of finishing aizen. This is the point at which ichimaru gin passes away.

Answer 2

He was good, then he left Soul Society with Tosen and Aizen, and then

*spolier*

***********Chapter 415 he is shown to turn on Aizen.**************

So he's a good guy?

He is a really stupid good guy. He joined Aizen in order to kill him and protect Rangiku, but he chose to attack when Aizen was basically invincible. He was an idiot because he was with Aizen for over a century, but waited to strike when Aizen was invincible. It makes no sense. So yes, he was a good guy albeit a stupid one.

He was always a good guy however he should have used his attack before Aizen fused with the hogyoku, but Gin never knew Aizen's goals until he had accomplished them. Note: In the anime, 307, Gin uses his bankai's true ability and destroys all the cells within Aizen's chest and pretty much killing him, however neither of them knew the hogyoku could heal Aizen that well, and with the hogyoku removed from Aizen's body.