Alternative Forms




Attacks aerial enemies first

Operator Description

Kroos, Sniper Operator of Rhodes Island, will interrupt the enemies' attacks with her crossbow.

Operator Quote

She is always aiming at her target.

Obtain Approach

Recruitment & Headhunting
Headhunting: Yes Recruitment: Yes
Release Date (CN) 4/30/2019
Release Date (Global) 1/16/2020
Recruitment Pool Date (CN) 4/30/2019
Recruitment Pool Date (Global) 1/16/2020


Potential Item

Kroos's Token A collection of shooting toys, including a plastic bow, several sucker arrows and an apple to be used as a target.


When attacking, has a 10% chance to increase the current damage of that attack to 150%
When attacking, has a 10% chance to increase the current damage of that attack to 160% (+10%)
When attacking, has a 20% chance to increase the current damage of that attack to 150%
When attacking, has a 20% chance to increase the current damage of that attack to 160% (+10%)
Talents from Module Upgrades


Arts Resist
Redeploy Time
DP Cost
Attack Interval


SP Cost:
Initial SP:
SP Charge Type
Skill Activation
Skill Effect
The next attack shoots 2 in a row, dealing 100% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 105% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 110% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 120% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 125% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 130% of ATK in physical damage with each shot.
The next attack shoots 2 in a row, dealing 140% of ATK in physical damage with each shot.
Detailed Skill Info
atk_scale (Attack Scale) 1
times 2
atk_scale (Attack Scale) 1.05
times 2
atk_scale (Attack Scale) 1.1
times 2
atk_scale (Attack Scale) 1.2
times 2
atk_scale (Attack Scale) 1.25
times 2
atk_scale (Attack Scale) 1.3
times 2
atk_scale (Attack Scale) 1.4
times 2

RIIC Base Skills

Slowcoach Lvl: 1
Room Type:
When this Operator is assigned to a Factory, productivity +15% in the first hour and thereafter +2% per hour, up to +25%
Solitude Lvl: 1
Room Type:
When this Operator is assigned to a Dormitory, self Morale recovered +0.7 per hour

Botzu's Quick Evaluation

+ Trait: Prioritize attacking aerial enemies
+ Talent: Each hit has a chance to crit for additional damage that makes her randomly hit really hard
+ Great for early Challenge Modes since you need cheaper units and she deals more damage than the 4* Snipers at equal levels
- Says "Ko Ko Da Yo" every 15 seconds

Operator Overview

“Doctor, let's play a game~ Put an apple on your head and we'll start~”

Some Doctors disparage Kroos for her drawling voice and her repetitive “Ko~ko~da~yo” catchphrase (which roughly translates to “I’m here” or “Here I am”). However, many other Doctors swear by Kroos as a staple Sniper for the early- and mid-game of Arknights. A 3★ Anti-Air Sniper with surprising burst damage potential, Kroos can even pull her weight in difficult late-game stages, especially if you don’t have multiple higher-rarity Snipers who can replace her.

The trick is in how smoothly Kroos’s kit synergizes with itself. Her Talent, Targeting – Primary, has a random chance to increase the damage of her attacks (like a critical hit in other games). Meanwhile, her Double Tap – Auto Skill automatically triggers every few attacks and causes her to shoot two stronger arrows at once. With her naturally quick rate of fire and the constant extra shots from her Skill, Kroos activates her Talent quite frequently, punching through enemies at a terrifying rate. As a 3★ unit, her cheap DP cost and low investment cost are appealing bonuses, as well as being able to max Potential easily.

Of course, being a 3★ unit also means that Kroos cannot E2-promote, which puts a cap on how much she can grow to help the team. Promotion gives higher-rarity Operators access to more levels and additional Skills, giving them an advantage. On the other hand, many stages are easier if you deploy multiple Snipers, and while Kroos may fall behind over time, she’ll remain an excellent backup Sniper for much longer than you might expect. So look out, drones! “Ko~ko~da~yo!”

Newbie Tier List Explanation

Free upon completing stage TR-8, an excellent go-to AA Sniper.

Integrated Strategies Tier List Explanation

General IS Notes

+ Powerful, constant Physical damage.
+ 0 Hope Cost.
- Doesn't scale well past earlygame, but can still take care of Neural drones.

IS2 Specific Notes

Good Relics

Golden Chalice
Wrath of Siracusans

Relic Interactions

Offensive SP recovery skills benefit massively from ASPD boosts. Additionally, S1 can greatly capitalize on Anger of the Siracusans.

Recommended Promotion

E1 Max recommended, as it is a pretty low investment.

Skill Upgrade Costs

Level Requisites Materials
1 ➝ 2
2 ➝ 3
3 ➝ 4
4 ➝ 5
5 ➝ 6
6 ➝ 7

Overall Skill Cost

Elite Upgrade Costs

Level Materials

Overall Elite Cost

Total Cost

Operator Missions

Requires [Alter] version unlocked; Unlocks at E1, Level 1 (Server: NA)
Requires [Alter] version unlocked; Unlocks at E1, Level 55 (Server: NA)

Operator Profile

Artist Xiàyě Hóng Míng
CV Azusa Tadokoro
CV (EN) Grace Hogg-Robinson
CV (CN) 苏婉
CV (KR) 梁静花
Gender Female
Place of Birth Rim Billiton
Birthday November 22
Race Cautus
Height 154cm
Combat Experience
1 year
Infection Status Infection confirmed by medical examination.
Physical Strength Normal
Mobility Standard
Physiological Endurance Normal
Tactical Planning Standard
Combat Skill Excellent
Originium Adaptability Standard


Originally from Rim Billiton. Kroos also received her training from the Columbian Garrison at Holmegard with Fang and Beagle. She is calm and constantly smiling as she maintains a gentle demeanor. However, she sometimes breaks her facade, revealing a sharp-tongued, ferocious side.

Clinical Analysis

Increase Trust to 25.
Imaging tests have shown the outlines of her internal organs to be indistinct due to abnormal shadows. Originium granules have been detected in her circulatory system, confirming her to be infected with Oripathy.

[Cell-Originium Fusion Rate] 8%
She presents no obvious external symptoms of Oripathy.

[Blood Crystal Density] 0.23u/L
Degree of infection is minor and physical symptoms are not yet present.

Archive File 1

Increase Trust to 50.
Kroos prefers put in the absolute minimum effort in life and on the battlefield, which is reflective of her weapon of choice - a modern crossbow. Despite her lazy work ethic, Kroos has become a skilled marksman and assists her fellow Operators by flanking the enemy and shooting them in the rear with deadly precision.

Archive File 2

Increase Trust to 100.
Ever since she was a child, Kroos lacked initiative. But during training, she showed an exceptional talent for marksmanship. On the battlefield, she effortlessly locates ideal sniper nests and rains down a hail of precise and deadly fire while backed up by her teammates. Both Fang and Beagle trust Kroos with their lives and she is their support sniper of choice.

Archive File 3

Increase Trust to 150.
While a member of the garrison, Kroos faced everything with a smile. Upon being infected with Oripathy and suffering discrimination, she had a complete change in mood. After angrily cursing out the other members of the garrison, she along with Fang and Beagle left the garrison for good. In order to find a way for the three of them to survive, Kroos searched far and wide before finally discovering their new home at Rhodes Island.

Archive File 4

Increase Trust to 200.
The always smiling Kroos often leaves others with an affectionate impression but does so in order to avoid trouble. She enjoys finding quiet places to slack off and take naps. Although she is typically well-mannered and aloof, when something she cares about is on the line her persona shifts into a more ferocious persona. Even when she is talking, she occasionally displays hints of that ferocity. This facade works on Fang, but not Beagle as Kroos cannot withstand her piercing gaze.

Voice Lines

Appointed as Assistant Doctor, it's such a nice day, so can't we take a little nap?
Talk 1 Hmm...? We're about to leave? But I just got up... Wait, is this the Doctor's office? How'd I get here?
Talk 2 Why am I always squinting? Because I don't want anyone to see my eyes. Nope, nobody~
Talk 3 I'm really careless and get hurt a lot... But Hibiscus heals me every time, so I'm not afraid of getting injured. Oh gosh, that 'Curing Cuisine' of hers though, I'm terrified of it...
Talk after Promotion 1 Doctor! Someone left 10 alarm clocks by my bed! Who would do something so awful?!
Talk after Trust Increase 1 Doctor, let's play a game~ Put an apple on your head and we'll start~
Talk after Trust Increase 2 I'm always looking for fun things to do as a way to ease the pain of my Oripathy, I guess. Plus, I love seeing other people smile~
Talk after Trust Increase 3 One day, our journey with Rhodes Island will come to an end, and hopefully we'll all get to have a warm, neverending dream, lying in the sunshine~ That's my number one dream~
Idle Can't believe the Doctor's a heavier sleeper than me...
Onboard Hi-hiii~ I'm Kroos~ I might be inexperienced, but I'll do the best I can~
Watching Battle Record Thank you so much!
Promotion 1 A promotion~ What a lovely dream~ Huh? I'm not dreaming?
Added to Squad Umm, where's the rally point?
Appointed as Squad Leader Huhhh~? Fang would make a better captain than me!
Depart Listen, everyone~! Stay calm~
Begin Operation Why can't everyone try to get along...?
Selecting Operator 1 Sure!
Selecting Operator 2 Let's take it slow~
Deployment 1 Mmhmm, I'm listening~
Deployment 2 I won't sleep on the job~
In Battle 1 There you are!
In Battle 2 Heeere I aaaaam!
In Battle 3 Take aim!
4-star Result Phew, that was tough...
3-star Result I think we did alright!
Sub 3-star Result Hmm, I guess this was a bit of a letdown...
Operation Failure S-sorry... I'll fight harder next time...!
Assigned to Facility Can I get my beauty sleep in here?
Tap Ughh...
Trust Tap Hmm, have I matured?
Title Arknights.
Greeting Doctor~ *Yawn*...

Operator Records

Record: Apples
Unlock: E1, Level 55, Trust Required: 50

Paradox Stages

Stage Name: mem_kroos_1
Unlock: E1, Level 55
This simulation aims to test a decision maker's command capability, a whole team's rapport, and a Sniper Operator's ability to cope under pressure.
Within, Sniper Operators are this simulation's focus target.
Pains have been taken to assemble this simulation's team, and ample personnel are present, but lack direly for long-range output methods.
Focus area has been assigned to Operator Kroos. As her detachment's sole Sniper Operator, her composure and firing skills will determine what direction the simulation's outcome goes.