If you're looking for an 8s Grenadier, well, she was always a very strong choice, and now she's pretty much almost the default one for most circumstances by sheer stats and having the 2 accessory slots. Improved Grenade performance (not that most enemies will notice) and bonus MIRVs on top of that. She does get bonuses with M4, but due to the fact M4's marks affect her targeting (and potentially are buggy with her MIRVs), using her with M4 is not always ideal.

Aside from that, it's the same old SOP, but with a unique equipment (thats pretty much just an improved Eotech) and bigger numbers.

After literally years, M4 demonstrates WHY SHE IS THE HEROINE and becomes METAL GEAR.

She keeps all her old benefits but has 5 star multipliers and better stats now. This gets even better when Mod3 when she gets a unique that ups her firepower and ALSO gives her armour, so she can kinda tank in a pinch. Her buff tiles are ALSO slightly improved. Her mod 2 skill also tags enemies and enhances the mod skills of other Anti-Rain units.

The big thing however is the desperation mode. At mod2 onward, when 3 or fewer allied dolls are in battle (you can retreat 2 units to force this, or simply deploy her with a partial strength echelon), she pulls out the portable cannon and proceeds to deal hilarious damage that makes grenadiers wet their pants, as huge AoE blasts firing from every dummy. The blasts are kinda 100% accurate (the main hit can never miss, even at night, but the splash damage can. Its weird), and can partly crit (its complicated), and is meant to be a last ditch thing to save a fight under dire circumstances (of course, we instead abuse it). This is however, a doubled edged sword, as her RoF also goes down, so its possible for some enemies to slip by if you havent taken this into account.

Basically, Mod her first. She's pretty much priority #1 for modding.

The pinkhaired tryhard who is absolutely every bit as good as she says she is. 1 of the best sustained DPS ARs in the game, and can actually hit the RoF cap on her own. She can actually outDPS OTs-14 and 9A91 at night against up to moderately armoured opponents (moderate. Dont try to send her vs Hydras)

As a bonus, her mod skill ups her DPS some more by making her pull out ANOTHER gun and throwing extra attacks that do a % of her main damage, with more damage if paired with M4Mod.

Her mod skill however, does look absolutely retarded unless you're in her mod 3 form. Normally she's supposed to pull out another gun, but since her school skin and base sprite dont have that animation, she instead fires from her scope.