What would a Japanese light cruiser designed to succeed the late-war cruiser classes look like?
Short answerIt would probably look broadly similar to the Ōyodo class, which provided a sound basis for further development.
NotesA successor to the Japanese light-cruiser lines in the question would probably resemble the Ōyodo class. The reason given is that Ōyodo already provides a decent design. The expected development is therefore a broadly similar ship rather than a completely new arrangement.