These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Tear Jerker: Baumusu's death in Mark of Kri. Grizz's death in Rise of the Kasai. Even more so, considering that Tati has to cut Grizz's skin off just moments after he dies so the Kasai can't keep his mark.
That One Level: Igua Hatu. Not for the actual difficulty of getting through it, but for the challenge conditions that must be met to obtain the Arena, such as killing five mooks with falling barrels or using every combo attack with every weapon.