rensouhou-chan
Shimakaze (kancolle)'s familiar-like gun turret sidekicks in Kantai Collection. They are based on the ship's twin 12.7 cm/50 naval gun turrets. One of them has a lifebuoy with the word "γγγΎγ" ("Zekamashi", "Shimakaze" reversed) on it.
Amatsukaze also has one which she calls "Rensouhou-kun". The difference compared to Shimakaze's is that it is encased in a ship-like hull and it has rounder facial features.
Akizuki (kancolle), Teruzuki (kancolle), Suzutsuki (kancolle), and Hatsuzuki (kancolle) have their own familiars called "Chou-10cm-hou-chan".