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Tear Jerker: Ginga Densetsu Weed
This troper never really cared about Ginga Nagareboshi Gin, but John's death brought her closer to tears than any other scene in the series. This troper wanted to reach through the screen, tear out Hougen's intestines and see how he liked it!
Specially when during his beating to death, his thoughts goes to Gin, and he apologizes for not being able to be with him again. To the original Ginga Nagareboshi Gin viewers, that was especially tear jerking.
I thought both series were chock full of tear-jerker character deaths. It's weird how a very violent and gory talking-dog anime would have that sorta effect on anyone. I was also a bit teary-eyed when Bat and Kite's lives were spared and you see them shed tears.
Jerome's death in the anime. You don't learn about it until after the fact, but this troper and all her friends wept over him, as he was their favorite character, not to mention he had one of the more touching backstories/subplots. Weed imagining him returning at the end of the final episode is a particularly cruel tease.
What about GB's death in the manga? Really, I think that beats every other scene in the entire series. GB dying in his godson's arms after giving his life to save him from the Hybrid Bear... it's pretty damn depressing, especially since it was just around that time when GB was beginning to get over his cowardice and realize his full potential. That poor sweet dog...
Quite a few. Of the more notable, Teru's father's death.
When we see Hidetoshi from Ginga Nagareboshi Gin shooting the dogs he believes to be Gin and even his former dog John as a result of the Ohu dogs being mistaken for killing people (when the real culprit is Kaibutsu).