
A Reimu variant with bushy braids, instead of the normal long ones tied in ribbons. Compared to other rare variants of yukkuri, they seem to be relatively common.
Wasas are often shown to be particularly spoiled and prone to becoming shitheads, although this is far from a guarantee. In most stories, wasas, because of their spoiled attitude and total lack of awareness, often become responsible for the horrible consequences fell upon their siblings, entire family and in same cases, entire herd. Pretty much all wasas can be considered anger inducing.
In addition to the usual shithead behavior, some of the well-known traits of Wasa-Reimus are:
Because of their different appearance, many (but not all) reimu mothers usually give special treatment to their wasa children, despite awful behavior shown by the wasa-reimus, which usually results in above consequences. As depicted here: pool #1449
This is not always the case however, as some smart parents who are aware that wasas are basically ticking time bombs take appropriate measures as seen here: post #81760
Another example of a smart herd which gets rid of wasas whenever they appear: post #76352 (please note the reimu in the bottom panel vomits the minute she hears word "wasa".)
Because of their trouble making personalities, most pet shop owners refuse to raise or even let wasas in, not even as cheap predator food. Wasas very, VERY rarely survive long enough reach adulthood, so much that an adult wasa is often considered a rare yukkuri.
For a detailed study of Wasa-reimus' nature, see pool #1978
"Wasa wasa" is the sound of rustling braids, similar to "piko piko", but with a connotation of something very furry or hairy. Since this Reimu has very bush braids, she is called "wasa wasa".
This tag implicates bushy_braids and reimu (learn more).