Module 2

Wow, that's luxurious.

Assuming you mean operators that are frequently used and liked are good, personally I recommend Naruantuya, Remyuan, and Ela…! Naruantuya When attacking enemies within 8 tiles around yourself, your attack power increases and you can perform a 'Snatch' action twice, further enhancing the strengths of your role. Remyuan Stage 1's Attack SP+1 improves skill rotation. Your total firepower also increases with +2 ammo capacity. Ela You can deploy her on the ground, allowing you to place traps on high ground. This makes her placement independent of the map, which is incredibly strong! Even on maps with few high grounds, she can coexist with other high-ground damage dealers.

I don't have her, but maybe it's the Alter Lapland? I imagine she's already strong, so she'll get even stronger lol Personally, I'd recommend Nian! She's a reliable operator for me too! I haven't unlocked her modules because I haven't unlocked her episode, but I think she'll probably get even stronger d('∀'*) I personally like the Starfire Thorns, but I rarely see anyone make her their main, so maybe she's a niche pick~. Also, you can't unlock modules without unlocking the episode, so I haven't unlocked her modules either lol

I'm a mimic doctor. I've equipped modules on Remuian, Ifrita, Altered Pramanix, Altered Lappland, and Naruantuya lol

Among noteworthy operators not mentioned above, Nasti is interesting. As she's a permanent operator, I gave up on obtaining her, but she perfectly synergizes with all elevated positions. If you're enhancing Nasti's module, I strongly recommend Stage 3, as it changes the user experience and it's more rational to upgrade all at once rather than partially. In terms of synergy with selected elevated positions, she has particularly strong compatibility with Nearl, Melantha, Ifrit, Pramanix, and Lappland. Nearl's attack speed within a short range per unit of time and Nasti's multiplicative buff perfectly align with S1's multi-hits. Melantha's characteristic wide attack range and damage buff apply to all skills, and also contribute to the power of S2's lock-on sniping. Ifrit can draw a straight line anywhere, drastically changing the battlefield. Since many maps involve enemies charging straight ahead, the synergy with Nasti is at a level where Ifrit doesn't even need her module. Pramanix's S2 snow attack also benefits from the damage boost, making her subtly powerful. Lappland, needless to say, synergizes well with all-directional attacks; increasing her per-unit damage will contribute to enhanced annihilation capability.