Introduction
Whether you’re a commander looking to get their echelons ready for future content or a commander who’s hoping to compete for the high spots on the ranking leaderboards, the act of duping, or raising multiple copies of the same T-Doll, is one of the oft-touted ways to help make that easier. From a gameplay standpoint, duping can offer higher return-on-investment than raising only unique T-Dolls. That being said, for most GFL content, duping is by no means mandatory, and many people choose not to dupe for various reasons.
What is Duping?
Duping in Girls Frontline is, quite simply, the act of raising multiple copies of the exact same T-Doll. Every G&K T-Doll in your armoury can only be assigned to one echelon at a time, so raising additional copies beyond the first allows that unit to be used in multiple simultaneously deployed echelons. The vast majority of content in GFL, like all story and event maps including ranking stages, allows duplicate dolls to be used. At the time of writing, Theater is the only event in GFL that doesn’t allow for dupes to be used, both for dolls and fairies. Note that, at the time of writing, duping is not necessary for any content, with the sole exception of competing for the top 5 to 10 placements in so-called "modern" rankings. However, as the difficulty of fights in ranking continues to climb, duping has become far more appealing to those looking to compete in ranking at a high level.
G&K
Starting with the recommended G&K dupes. Number of recommended dupes are in parentheses after the name of the T-Doll. These recommendations are based on usage statistics and performance in upcoming rankings, and will change as new units and rankings are released. Note that these dupes are intended for players that have already raised a large roster covering most niches that will come up in any content; it is much more important to raise strong units you do not already have over duping units before you can cover all niches.
HGs
P22 (2-3)
Incredibly versatile with Shields, Evasion and FP buffs to the correct targets.
Permanently farmable in Isomer campaign.
Kolibri (2-3)
Insane amount of buffs from one Doll.
Limited Doll that only shows up by dartboard.
Webley (2-3)
Massively buffs team leader with FP, RoF and CDR.
Limited Doll that only shows up by dartboard.
SAA Mod (2-3)
Consistent FP buffer with repetitive RoF buffs.
Production.
Nagant Mod (2-3)
Night FP debuffer and 0icd fp buffer.
Production, common drop.
Mk23 (2)
Strongest night FP buffer.
Production.
HP-35 (1-3)
At night, passive vulnerability for all enemies, Damage reduction for the entire echelon and even more vulnerability during uptime.
Production.
Zip .22 (2)
Zip offers some incredible debuffs with a 1 second ICD, slowing down the enemy and often giving enough time for the Maintank to get their Skill active before being shot at much.
Production.
P290 (1-3)
P290 is a Damage debuffing HG who also has extra utility on top of that. Her 25% Damage debuff is lower than Night specialists such as Nagant Mod's 40%, but she also offers 30% Night Vision to the entire Echelon and also stuns all High-Threat enemies once 8 units are within range. Especially the latter one can be absolutely amazing considering how annoying a lot of the High-Threat units are, for example Snytos.
Limited Doll that only shows up by dartboard.
P10C (1-2)
P10C allows you to make the entire Echelon immune to damage for a short moment with each Skill activation. Requires manual control and knowing what you're doing to make good use of.
Production.
SMGs
RFs
SCAR-H (2-14)
Flat RoF buffs for allies and self. Used with SCAR-L for unity skill.
Production.
Kar98k Mod (2-3)
Does what Grape does but doesn’t have a non-elite clause. Has current target targeting.
Production.
Hanyang Mod (1-2)
Piercing attacks, extra buffs at night.
Production.
Grape (1-2)
Nukes an enemy, has a non-elite clause limiting her targets.
Production.
ARs
SCAR-L (2-14)
Dupable M4Mod, insane additive Damage buff. Needs SCAR-H due to unity skill.
Production.
AK15 Mod (1-2)
Nukes an enemy with highest FP targeting clause, scales with links and ignores HP shield and Armor.
Production.
Ribeyrolles Mod (1-2)
Most powerful buffs to ARs. Also increases SMG survivability.
Production.
MGs
SGs
LTLX7000 (2-9)
On activation, powercreep all existing SGs. Knocks back enemies consistently, cleanses buffs, massive Armor buff to self, also has passive Damage reduction.
Production.
M500 Mod (2)
Shield spam with the correct enablers.
Production.
SPAS-15 (1-3)
Massive armor and shield buffs for SGs with the right setup. Also has CDR tiles for SGs and MGs.
Production.
Nova (1-3)
Shields allied SGs or buffs MG accuracy depending on position.
Production.
FO-12 (2-3)
Eliminates one non-elite, knockback goddess.
Production.
DP-12 Mod (1-2)
Massive HP shields, scales flat armor passively as combat progresses.
Production. Mod batch after LS.
Fairies
Second strongest combat aura, allows you to teleport on the map.
https://gamepress.gg/girlsfrontline/how-get-fwee-pawa-free-parachute-fairy-guide
Illumination (1-3)
Allows you to see the map at night. Enables more easy use of Parachute at night.
Also has 10% night vision. EN skill text is wrong.
Witch (2-4)
Witch Fairy
Strongest combat aura, useful Damage over time skill.
Ranking fairy from PR.
Sniper (1-2)
Max HP% Damage with 20k cap. Also applies Vulnerability to her target which increases Damage past the Damage cap.
Shield (1-2)
Applies an HP shield to echelon that buffs both Damage and Damage reduction.
Farming
Everything in this section is 1x, or 1-link. Fielding 1x units is cheaper but this is purely a brainrot level of optimization for some farming.
Vector (2)
For 13-4 farming.
Production.
M26-MASS
Rodel immunity for farming, doesn’t need flash.
Production.
Zip
1s icd massive debuffs to most notably move speed, delaying enemies significantly.
Production.
LTLX
Still does LTLX things even as 1x.
Production.
MPL
Shields, lots of shields.
Production.
Coalition
Ringleaders cannot be duped, or you’d be incentivised to have 14 Scarecrows.
Key Units
Needed for most general use
Manticore (4+)
Delays enemies, deals AoE Damage, can also tank well with decent armor and evasion.
Nemeum (4+)
Front-targeting ranged Damage dealer.
Aegis SWAP (2-4)
Armor, HP shield and evasion. Pure tanking.
Goliath Factory (3+)
Causes enemies to shoot at reinforcement beans instead of anything more important.
Jaeger (2-4)
Backline-targeting ranged Damage dealer.
Jaguar (2+)
Backline-targeting linksplash Damage dealer.
Notable Units
Used for more specialized echelons
Jaws Paradise (2+)
Summer seasonal variant of Goliath Factory. Has extra utility through buffs for allies and stuns for enemies.
Ripper SWAP (1-2)
Evasion tank with short duration 100% force shields.
Dragoon SWAP (3+)
Massive HP shields, evasion and does good Damage.
Tarantula (4++)
Melee rush Tarantula spam.
Prowler SWAP (4++)
Melee rush shield and buff core.
Jaeger SWAP (2+)
Stronger Jaeger, higher cost.
Gingerbread Guard (1-2)
Significant health increase which also means higher shields compared to SWAP variant.
Dinergate (2)
With only 2 cost, can be easily slapped into echelons to give them a bit more kiting and tanking options, also useful at breaking Orthrus Shields.
Corpse Bride (1)
Used for Moth Hunter, not worth raising unless you are actively using her.
Scrap
In no particular order… almost all the non-swap units end up here because they’re completely outclassed.
Partially useable units that just don’t see much use, keep 1 max
- Striker SWAP
- Guard SWAP
(Completely outclassed by Gingerbread Guard) - Vespid SWAP
The following are completely useless due to lack of power or significantly stronger variants
- Aegis
- Dragoon
- Brute
- Prowler
- Guard
- Scout
- Vespid
- Ripper
- Striker
