>>3103207The -fu ending in daughterfu literally means "waifu". For example, Upotte has gunfus, kancolle boatfus, GuP tankfus. All waifus.
Daughteru is just the word daughter with a common Japanese -u ending. (words ending in d or t, like husband, likewise get an -o ending: husbando). This is the ending if you wish to sound stereotypically Japanese; "dishonoraburu", "shokku", "gurando suponsaa".
