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I am kind of resigning myself to having to use cash shop to redesign my character models.
Then you take 10 pieces of the combination item and make a free voucher for that specific redesign option.
Those quests are easy, like "run x meters", "jump x times", etc.. I think 1 month should be enough for you to get all 3 kinds of vouchers for free, considering RNG.
Thus, only your GENDER and CLASS can't be changed for free, and CLASS can't be changed even with merets.
If it is worth getting the extra 2 clicks, idk. I may as well try to get the probably highkey nickname i want with any character and then wait a few weeks to get the name to a new body as well.