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Tear Jerker: GaoGaiGar
The aftermath of the final battle with EI-01. Yeah, they don't actually die, but everyone's reactions when they think they have are nothing less than heartbreaking.
Professor Leo's reminiscing about his late wife will tug at the heartstrings. Doubly so when they reunite at Jupiter
Professor Leo's death.
The end of the battle against Zonuda. Mikoto is begging Guy to kill her while she still has control of her body, while he walks out onto GaoGaiGar's hand, holding a battered Mamoru. Zonuda sublimates his cyborg systems, as he says that they'll die together and walks towards her. He borrows Mamoru's powers, using purification. In the end, they both survive, but the scene is still very touching.