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Electric element who has the 
Saboteur job assigned to them. The character is also known by the Blitz codename and their persona is Kiskil-lilla.To learn more about Kumi Katayama check the sections below. Use the tabs to quickly switch to the kind of information you're looking for.
Profile
All Character information about Skills, Passives, Dupes etc. has been translated from Chinese to English by us. We will update them with Official Translation as soon as it's available.
All Skill Values are shown at Level 10 for Characters as the majority of the players will be using their characters with said levels. Said values do not include additional bonuses from outside sources such as Mental Images. Also, characters do not have 1 More, Basic Attack and Gun skills listed as the latter two are barely used, and 1 More is a generic follow-up primarily used to down enemies weak to certain elements.
Discharge Sprocket
Cost: 22 SP
Target: AoE
Type: Electric
Deal Electric damage to all foes equal to 101.7% of Attack, and inflict Hard Knocks for 3 turns. When in Lightning Legs state, also increase this skill's damage by 35%.
Also, Secret Technique: Lightning Legs can be used 1 time.
Hard Knocks: Decrease Defense by 9.8% (for every 10 points of Speed, increase by 2.22% more, up to a maximum of 39.0%). Also, increase damage taken by 7.8% (for every 10 points of Speed, increase by 1.78% more, up to a maximum of 31.2%).
Thunderbolt Outrage
Cost: 20 SP
Target: AoE
Type: Electric
Deal Electric damage to all foes equal to 135.5% of Attack. Decrease Down Points of all targets that take damage by 1 regardless of Electric affinity, and inflict Hard Knocks for 1 turn. When in Lightning Legs state, decrease Down Points of all targets that take damage by 3 more and inflict Detention for 1 turn.
Hard Knocks: Decrease Defense by 9.8% (for every 10 points of Katayama's Speed, increase by 2.22% more, up to a maximum of 39.0%). Also, increase damage taken by 7.8% (for every 10 points of Katayama's Speed, increase by 1.78% more, up to a maximum of 31.2%).
Detention: Increase damage taken while knocked down by 0.56% for every 10 points of Katayama's Speed (up to a maximum of 9.8%). Also, increase damage taken by 6.8% (for every 10 points of Katayama's Speed, increase by 1.55% more, up to a maximum of 27.3%).
Secret Technique: Lightning Legs
Cost: 25 SP
Target: AoE
Type: Electric
Deal Electric damage to all foes equal to 141.9% of Attack. When targets take damage, decrease Down Points by 5 regardless of Electric affinity, and inflict Detention for 1 turn.
When this skill knocks down any target, gain Lightning Legs for 2 turns.
Detention: Increase damage taken while knocked down by 0.56% for every 10 points of Katayama's Speed (up to a maximum of 9.8%). Also, increase damage taken by 6.8% (for every 10 points of Katayama's Speed, increase by 1.55% more, up to a maximum of 27.3%).
Lightning Legs: Enhance the skill effects of the next Discharge Sprocket or Thunderbolt Outrage used.
Thief Tactics
Cost: -
Target: AoE
Type: Electric
[HIGHLIGHT]: Deal Electric damage to all foes equal to 317.6% of Attack, and 50% chance to inflict Dizzy on foes for 1 turn. Also, permanently decrease the target's Defense by 29.3% (this effect does not stack). Also, increase damage taken by 19.5% for 3 turns.
Answer the Call
Cost: -
Target: -
Type: Passive
When an ally attacks a knocked down foe, increase Attack by 36.0%.
High-Speed Vector
Cost: -
Target: -
Type: Passive
During battle, when Katayama's Speed is above 100, increase Attack by 24 for every 1 point of Speed above 100 (up to 1920).
Tenacious Teacher
Awareness 0
When Katayama uses Discharge Sprocket, Secret Technique: Lightning Legs is unlocked and becomes usable 1 time.
When Secret Technique: Lightning Legs deals damage, greatly decrease the target's Down Points regardless of Electric affinity. Also, increase the Defense decrease effect of Hard Knocks by 10% for 2 turns (for every 10 points of Speed, increase by 2.22% more, up to a maximum bonus of 40%).
Lightning Lecturer
Awareness 1
When Katayama knocks down a foe, permanently decrease the target's Down Point maximum by 1.
When a target is inflicted with Detention, increase critical damage taken by 30% more for 1 turn.
When Katayama deals Electric damage, inflict Shock on the target.
Role Model
Awareness 2
When Katayama knocks down a foe with a skill, increase the target's damage taken while downed by 10% more for 1 turn. Also, permanently increase party's Attack by 10% (stacks up to 3 times).
Electric Cycle
Awareness 3
Increase the skill levels of Discharge Sprocket and Thunderbolt Outrage by 3.
Class in Session
Awareness 4
Highlight Enhanced: After activating a Highlight, the next time Katayama knocks down a foe, permanently increase the target's damage taken by 20% more. This effect does not stack.
Unstoppable Light
Awareness 5
Increase the skill levels of Secret Technique: Lightning Legs and Thief Tactics by 3.
Unconditional Love
Awareness 6
At the start of battle, gain 2 Wings of Guidance stacks. Gain 1 Wings of Guidance stack after every 2 skills used. Wings of Guidance stacks up to 3 times.
At the start of Katayama's turn, spend 1 Wings of Guidance stack to gain the following buffs for 1 turn. Increase Katayama's Attack by 50%, critical rate by 10%, critical damage by 30%, and allow her Highlight to activate critical hits. Also, increase damage taken by foes with Hard Knocks by 30% more, and increase damage taken by downed foes with Detention by 20% more.
When Katayama takes fatal damage, if she has Wings of Guidance, spend 1 Wings of Guidance stack to evade that damage (this effect activates once per battle, and is not effective against certain skills).
Review
Blitz is an Electric Saboteur that mainly focuses on knock down and can inflict Defense Down. All foes will take 10% more damage when they're downed and Blitz has debuffs that can increase this independent multiplier (similar to Oracle for Weakness Damage).
Her Skill 2 and Skill 3 are her knockdown skills and they can decrease all foes' Down Points by 4 and 5, respectively. Almost all end-game fights have a standardized Down Points amount, with Single-Target fights having 6 Down Points and Multi-Target fights having 4 Down Points. This means outside of Electric Weak Multi-Target fights, Blitz has an extremely hard time constantly downing all foes, as they would have too many Down Points left, and since she has to build Speed, she would always act first, meaning she cannot do back to back knockdown as foes would regain all their Down Points, here's a few quick example in a non-Electric Weak Multi-Target fight:
Keep in mind, in order to down foes you need to decrease Down Points to -1, not to 0!
Turn 1: 4 Down Points > 3 Down Points (DPS dealt Weak).
Turn 2: 3 Down Points > Downed (Blitz Skill 3).
Turn 3: 4 Down Points > 0 Down Points (Blitz Skill 2)
Blitz also demands that you use her HIGHLIGHT in order to access part of her Defense Down debuff, adding to her already poor effects coverage when she can't do constant knockdown and limiting your HIGHLIGHT rotation.
On her CN debut, when compared to Turbo, which is a Standard Strategist with a similar role while being way more flexible, and one that people could have high Awareness of when Blitz was available, Blitz was mostly a luxury pickup for most players.
Overall, Blitz suffers a lot for being the first iteration of characters that can decrease Down Points before they get good. All the future characters that fulfil this role can give similar or even greater output while being significantly less clunky and more versatile.
Akihiko: Blitz can knock down foes to enable Akihiko’s game plan.
Awareness 1: Blitz can now be used in any Multi-Target fight, as she will permanently decrease all foes' Down Points by 1 after she knocks them down, meaning she can chain knock down after using Skill 3, then use Skill 2 the following turn. This also opens up using her in Single-Target fights but would still require work to decrease the foe's Down Points on time. She can now inflict Shock, which is 10% Crit Rate and can interact with things that care about Elemental Ailments.
Weapon: This weapon provides the Speed main stat, which helps with capping her debuffs. However, you can simply use the 3-star weapon to cap. The other effect is a 1-turn Critical Damage Taken debuff after any ally knocks down a foe, which is decent. Still not the best weapon to get.
Can deal heavy Down Points damage.
She has a very hard time knocking down foes outside of Electric Weak fights.
Has to use her HIGHLIGHT to access part of her Defense Down.
Build
Kumi Katayama builds details aren't available yet. They will be added soon.
4✷
Increase Attack by 24.0%.
When Katayama knocks down foes, increase Attack by 14.2% for each foe knocked down (up to a maximum of 42.7%). Lasts for 1 turn.
5✷
Increase Speed by 15.0.
After using Secret Technique: Lightning Legs, increase Katayama's critical rate by 9.0% for 2 turns.
If any foes are knocked down when Katayama is present, increase the target's critical damage taken by 30.6% for 1 turn.
Teams
Standard DPS team where you bring 1 Strategist for buffs and 1 Saboteur to cap on Defense Down.
Best Wonder Personas:
Thor - Shock, Electric Damage, Electric Critical Damage
Yurlungur - Critical Damage
Dominion - Attack Up, Damage Up
Dionysus - Critical Rate, Critical Damage
Surt - Defense Down
Wonder Dagger - Cyclotron