Blood type(Trollsona hemospectrum thing not actual blood X3)!

(Sorry if the category is weird I didn't know wut else 2 put it as :P) 

Does anyone else just feel like they just have to be on a certain place in the hemospectrum or an aspect?? Like I'm making my trollsona but it feels like I just HAVE to be a non canon classpect or a heart player. Its the same w the hemospectrum thing cuz for a trollsona I'm making 4 a friend a bronze blood makes more sense but it just kinda feels like they should be a gold blood or be a knight like nothing else will work :P!

(I dunno maybe this is just a skill issue)