Board Thread:Questions and Answers/@comment-50.250.14.94-20200102022139/@comment-39120971-20200106184452

Luck is at least consistent in what it does, if a bit obscure. It's basically present because RPG Maker (VX and VX Ace, but also MV and perhaps later ones) is set up so that characters have 6 attributes by default, besides their HP, MP, and TP (which Sierra Lee turned into SP). Luck is one of them and it's intended to work by changing the odds of status effects used by/on the character to be more favorable for you, so that the character's moves inflict effects more easily, while statuses inflicted by enemies are more easily resisted. This is all hooked up to RPG Maker's formulas, just like how AGI is hooked up to turn order, at least by default.

Normally these odds would be calculated by comparing the attacker's Luck x their move's base effect rate against the enemy's Luck x base status resistance, which is a whole lot of number crunching for what is ultimately just a dice roll. However, In TLS these calculations are simplified because Sierra Lee made the choice to give enemies resistances against specific statuses (just like they can have elemental resistances or weaknesses) instead of giving them high Luck to cover everything thrown at them. Indeed, most enemies in the game have a base 1 Luck (that's one of those neat details revealed by Duke Leto's awesome Enemy List PDF) so that the characters' chances of hitting them with statuses are affected as little as possible, except for some rare enemies, including bosses.

All in all, you don't really have to worry about the Luck of your characters, but there is also no real point to optimizing for it, either. I used to be quite hyped up on Luck, until Fluid-Decanter pointed out the actual benefit of giving +5 or +10 Luck being so insignificant... I guess it would matter in those RPG Maker games where your 6 attributes, Luck included, eventually grow into the hundreds and max out around 999, just TLS is not one of those games. So I mostly ignore Luck, other than keeping the Old Ribbon on Simon, as a keepsake of course, although I like to think it helps him a little bit since he has disabling moves/Unified Strike.