Can I get an analysis of Raiju and their parts, which would be best as a Wand Core?

Of course I can poppet. I do agree with your prior message, that Raiju Hair is the most likely core and we can explore that here.

Raiju Hair

Raiju are Yokai wolves of Japan, distantly related to the sapient Makami but not sapient themselves, and known most of all for their accumulation of static electricity and their lightning. Indeed, some of the smaller varieties of Raiju are known to be able to turn into ball lightning, though this phenomenon is rarely seen. Consequently, in wands Raiju Hair results in a wand which ought never be decorated with metal. Stones may be added, additional detailing to the wood, stain and lacquer… but not metal. Indeed, adding metal to a Raiju cored wand is known to cause them to badly backfire, often injuring not only a spell’s target but also it’s bearer. Nonetheless, they are reasonably powerful cores, making for highly reactive wands with an unusual knack for charms that modify, replicate or otherwise affect the weather such as spells for small winds, conjuring snowflakes, clouds and the like.