I'll start with my L1 (Russian), Portuguese (which I collected so far) and this one French borrowing which got me interested in this stuff.
Russian (slang):
– кун, кунчик "boy(friend)" (くん)
– тян, тянка, тяночка "girl(friend)" (ちゃん)
– няшный "cute", няш(к)а "cutie", няшиться "to cuddle" (にゃ🐈️)
Portuguese:
– caqui "persimmon" (柿)
– joquempô "rock-paper-scissors" (じゃんけんぽん)
– biombo "foldimg screen" (屏風)
– nisei "Brazilian-Japanese" (二世)
– miojo "instant ramen" (brand name 明星)
French:
– chifoumi "rock-paper-scissors" (ひふみ)
by Panates