Overlord_Venus
I‘d put Ranze first, as he is the main character initially of this world. Xuer second, Straxia third, Dwun and Grisha tied for forth( with possibly Grisha being a bit higher because of the close relation to CC). Then I’d actually put CC as last because he could be seen as the elder brother to Ranze and they normally die early to help charecter growth for MC. I‘m just guessing that a grade 2-4 system places in the relevance of plot on the worlds in the first place though. Unless it’s like the mysterious entity that transmigrates randoms.