LucyPick #1 of 6 · S5
Best overall: an Energy Regen main stat plus a squad-wide ATK buff with near-permanent uptime, which also makes the Guard Boars hit harder.
Effect
Stampede Accident
When any friendly unit in the squad attacks and hits an enemy, all squad member’s ATK increases by 2.5%/2.8%/3.2%/2.6%/4% for 8s, stacking up to 4 times. The duration of each stack is calculated separately, and each friendly unit can provide 1 stack of the buff. Passive effects of the same name do not stack.
Values at S1/S2/S3/S4/S5
Who Should Use Kaboom the Cannon
Ranks and notes come from each Agent's build guide on Zenless Builds.
RinaPick #2 of 5 · S5
A great match because Drusilla and Anastella count as friendly units, so Rina alone keeps about 2 stacks of the squad ATK buff almost permanently. Only a few percent behind her S1 signature.
Astra YaoPick #3 of 4 · S5
Lucy's signature at S5 is a solid pick. It gives 50% Energy Regen and up to 12% combat ATK for the whole team. The catch is that every member needs to hit the enemy regularly, and it lacks ATK% for her Core Passive cap.
LuciaPick #3 of 5 · S5
The safest A-Rank all-rounder: Energy Regen and a team ATK% buff. However, Rupture Agents mainly scale with HP, so ATK only partially converts into Sheer Force.
SunnaPick #3 of 4 · S5
A strong generalist pick: an Energy Regen main stat and a squad-wide combat ATK buff. Bubblegum's attacks count as a separate unit and add their own stack, so you can hit full stacks if you split your EX Specials well.
NicolePick #3 of 6 · S5
The best general Support engine after Weeping Cradle: an Energy Regen main stat and a near-permanent ATK buff for the team.
SoukakuPick #3 of 6 · S5
The best generic Support W-Engine and the most used on Soukaku: an Energy Regen main stat and a squad-wide ATK buff that's up nearly all the time. With it, Disorder teams can run an Anomaly Mastery Disc 6 and still have enough Energy.
Velina AirgidPick #4 of 6 · S1
Stands in for any A-Rank Energy Regen W-Engine: a pure stat stick, slightly behind the S-Rank equivalents but comparable to A-Rank Anomaly W-Engines.
YuzuhaPick #4 of 5 · S5
The best all-round Support W-Engine and her top pick outside Anomaly teams. Tanuki Kama counts as a separate unit, so together with Sugarburst Sparkles she keeps 2 ATK stacks up permanently.