Some missions require you use or beat someone with a high enough stat, but otherwise not important within this game.

No, but some mission do.

Short answer:

No, stats didn't affect anything.

Sometimes used for mission, but Lasengle themselves refrain using it because it too specific than traits (Giant, Female, Magical, etc.) or class.

Long answer:

Actually, yes. Just not on degree that majorly affect game.

Similar to how Heaven, Earth, Man works those stats also affected critical rate, gain rate, damage dealt, damage taken; thing like that. Worry not, its doesn't affect to the point of 1000-ish damage, but 0,01-ish so you won't really feel it.

Easiest example where stats affect things is Skills.

The higher skill rank is (EX and A) it became more difficult to find it substitute. OC 4 characters are the easiest example of this:

0,001? That's just one in a Thousand.

@Brichards719 I can’t read Japanese

Just translate it. I can read Hiragana and Katakana but not much kanji and I use that site a lot. It's definitely the best website when it comes to hidden value related stuff. Especially the NP gain pages.

Higher LUCK increases drop rates.

It's true - my dad is John Lasengle.