I think Arabic terms of endearment are the best, hands down.
7abibti, 3ayni, 3omri, 7ubbi, roo7i, 7ayaati... (There's so many that it took me like 10 seconds to write all those)
And here's a nice one from Algeria: Kebda! Meaning "liver". As in, you're so precious, just like my liver!
Chérie and mon amour are also nice. Ma dulcinée, ma belle, mon coeur...
Also, "babushka"
