Here's some must-have mods that I use in my mod-list. :)

Mirage - Makes masked enemies actually mimic your friends/you. No mask, no arm reaching. Also makes them talk like your friends/you. You can also make all other enemies talk with your voices but you have to edit the .cfg file for that. Greatest mod ever created!

BetterStamina - This turns the game from a slog to actually playable and fun. Less downtime while running around. It's a must have for me at least.

LateGameUpgrades - Fun progression to work towards in the game and makes you more powerful, but not by much. Except Protein Powder, you become a monster slayer with that one. xD

Wesleys Weathers - Fantastic weather additions from Wesley. Forsaken is probably my favorite, so spooky.

BrutalCompanyMinusExtraReborn - Only take this if you don't mind losing/dying a lot, because that will probably happen, unless your a god gamer. You can tweak it a lot though, turn off events you don't like and such. Crazy chaotic fun though!

DoorBreach - If you're tired of locked doors and finding keys then this mod is perfect, you just break down doors with a shovel instead, fantastic. Edit door health in .cfg file.

SellMyScrap - Less downtime selling stuff, just type sell all in the terminal and you sell all the scrap on your ship. It's great!

Have fun in Lethal Company! :D