All the redemption codes I've been able to find so far

If you found any other ones, please mention them in the comments and I will add them to the list!

If you're on mobile, scroll down in order to copy paste from my comments below!

NIKKITHEBEST

QUACKQUACK

nikkihappybirthday2024

dreamweavernikki

DISCORDSTYLIST

REDDITSTYLIST

GROUPSTYLIST

infinitynikki1205

BDAYSURPRISE

GIFTFROMMOMO

GIFTTONIKKI

無限暖暖公測FB社團限定

無限暖暖公測開啟

インフィニキDISCORD

INGIFT1205

Edit: Two new codes, thanks to commenters:

NIKKIBEWITHYOU

NIKKIRELEASE This code seems to have expired. It now gives the "Code usage limit reached" error upon redemption.

Edit 2: Another new batch of codes!

PEARFECTGUIDES

NIKKIXWEBTOON

ニキプレゼント1205

おめでとう

リリース

インフィニティニキ

Edit 3: New livestream code on 2025/01/20, I don't know how many of the above are expired by now.

HEARTFELTGIFTS