Yukkuri who have distinguished themselves with uncommon valor, selflessness and/or kindness. They are the polar opposites of shithead yukkuri. Note that even if family_friendly yukkuri are almost always nicehead types, they only apply in situations where they act above their own self-interests, instincts, and expectations of others.
Like shitheadedness, a nicehead trait of a yukkuri is usually a genetic trait that they're born with. No matter how much one teaches a yukkuri to be a nicehead, a yukkuris true nature will surface in the face of danger. And in those dangerous scenarios only a yukkuri genetically born a nicehead will continue to abide to their nicehead traits.
Nicehead yukkuri tend to stand out from the typical yukkuri by their almost-human level of intelligence, wisdom, and understanding of morality, especially the values of compassion and forgiveness. Unfortunately these traits make them particularly vulnerable and easily exploited, especially by shithead yukkuri.
It's worth mentioning that a yukkuri who appears to be a nicehead might have recessive shithead genes. In these cases the yukkuri will appear to be a nicehead, but when spoiled their shithead nature will surface. In contrast a "true" nicehead yukkuri will never become a shithead no matter how much they're spoiled, and in fact would think to return their pampering with more kindness.
See also:
COURAGE