Talk:World 4/@comment-24352957-20140113110037/@comment-121.105.217.120-20140113163854

They're of their own distinct class, namely, torpedo cruisers. I don't know about their official naval classification, but in this site, they're referred as CL(T), maybe owing to their origin as CL.

Going by RL spec, Kitakami and Ooi's displacements are well below 10,000t, which places them within light cruiser classification according to London Naval Treaty of 1930.

So, they are light cruisers with a lot of torpedo tubes.