Yukkuri version of kochiya_sanae. Has green hair and a frog-clip accessory. Sanaes are the most common rare type yukkuri.
As a rare-type yukkuri, Sanaes are highly regarded by humans and other yukkuris. Thanks to their rare status, some humans and yukkuris perceive Sanaes as easier, stronger and nicer than common yukkuris. While some stories do depict them as stronger and nicer, others depict them as weaker and as shitheads. Thus it seems that despite their rarity Sanaes are neither more likely to be capable niceheads nor to be weak shitheads, they're ultimately just normal yukkuri.
Sanae's are typically shown not to be born of Sanae parents but rather a Marisa-Reimu couple has a rare chance to give birth to a Sanae. In some canons this random chance is the only way to breed a Sanae and thus the reason they are considered rare.
Typical of rare types, Sanaes are often given favorable treatment by yukkuris and humans alike. This poses a risk of garnering jealousy of other yukkuris, particularly from a sibling whose mother favors the Sanae.
Some Sanaes are shown to be aware of their rare status and shithead Sanaes are typically shown to arrogantly attack and steal from others believeing that their rare status will prevent them from being harmed. While this is usually true for other yukkuris, humans tend to not mind harming shithead Sanaes regardless of their rare status.
This tag implicates touhou (learn more).