Ultrashroomz on 28 July 2016
Zelda and Metroid come to mind, though I'd say Zelda tends to fluctuate between dark and light hearted.
Xenoblade also has some pretty dark themes as well, especially near the end parts of the game.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."
