小儿子/Youngest Son: Shchors. Her Chinese name 肖尔斯 (Xiao-Er-Si) sounds similar to 小儿子 (Xiao-Er-Zi). People usually say Shchors is where you start to feel the Russian bias in cruisers, because of the HE fire rate and shell arc/velocity. It's thus like as if Shchors is WG's youngest son that she gets all the goodies. Shchors is also called 肖尔ZAO/ShchorZAO because of the fire rate.
克爹/Daddy-C: Cleveland. The sense of calling a ship "Daddy" is because they are quite good/op for their tier and when matched up against one, you are most often likely to get fucked pretty bad. In this case, Cleveland's AA and HE spam are no joke.
德爹/Daddy-D: Des Moines. American Piercing are the best daddy jokes. Also earliest nightmare of DDs.
爹斯科/Dadskva: Moskva. Russian bias supreme. She's your daddy, no questions asked.
最爹/Daddy-Mo: Mogami. See Cleveland. Reason: Start of IJN HE spam.
岛爹/Daddy-Shima: Shimakaze. Those 5x3 torps aren't joke at all against BBs.
卡爹/Daddy-K: Karlsruhe. Apparently, some find Karl to be actually a good ship.
污大老爷/Lewd Grandpa: Udaloi. "污大老爷" is read as "Wu-Da-Lao-Ye", which sounds very similar to Udaloi's Chinese phonetic translation 乌达罗伊 (Wu-Da-Luo-Yi). Well, consider that she's quite a good DD hunter, calling her a lewd grandpa who goes after little underage botes isn't too far of a stretch.
贝爷/Grand-daddy Bel, or Bear Grylls: Belfast. Most op cruiser is also felt in China. 爷 (grandpa) is a very humble way to address someone else as being more than one level higher than you in a certain way, such as being completely OP. Also, Bear Grylls is also called 贝爷 and he enjoys a high popularity in China. And not to mention that both Belfast and Bear Grylls are British.
三爷/Master-Mi: Mikasa. She gets this nickname for sharing the same name as the Shingeki no Kyojin character who's not OP at all...