 If you liked
Mushishi
|
 ...then you might like
Shounen Onmyouji
|
Similar era and characters' costumes and Japanese ancient mythology themes. Both anime have supernatural beings and a main character with a power to see them. Shounen Onmyouji deals with ayakashi(aka familiar) and is action-packed, while Mushishi has a slower pace, 'mushi' and darker themes.