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Below is a comprehensive and short overview on how you optimize your Nilou for combat, when considering the most recent META (Most Effect Tactics Available) for her. This overview has been provided by the NLM Theorycraft Team which is affiliated with the KQM TCN (KeqingMains Theorycraft Network). The information is update to date as of October 4th, 2022.
EN VA: Dani Chambers
JP VA: Hisako Kanemoto
Specialty Dish: Swirling Steps
Nilou is one of the newly released Sumeru characters that had first appeared in the Sumeru Archon Quest in 3.0. She will become playable in 3.1 as a five-star hydro sword user. She is the first character in the game to be "reaction-locked", meaning she is best used in teams that specialize in a certain reaction (Bloom).
The infographic below will show you everything that you need to get her to level 90 and get all three talents to level 10.
When talking about talent priority, it is important to understand that her main source of utility comes from her elemental skill. Knowing this, her talents should be leveled up as follows: E > Q > AA
Created by umbrellahime#0386 on Discord 
Nilou is capable of utilizing a small variety of weapons. Provided below are the the weapons that are best suited for her:
Five-star Weapons:
- Key of Khaj-Nisut
- Primordial Jade Cutter
- Freedom Sworn
- Haran Geppaku Futsu
- Mistsplitter Reforged
Four-star Weapons:
- Xiphos Moonlight
- Iron Sting
- Sacrificial Sword
- Festering Desire
- Sapwood Blade
Note for 4-star weapons: Most of the weapons provided here will need refinements with the lowest being R3 for maximum performance. However, having these weapons lower than R3 will not be a bad thing for Nilou.
Just like her weapons, Nilou also has a number of artifact options as well. Below are the artifacts that are best suited for her:
Artifacts:
- 2pc Heart of Depth + 2pc Tenacity of the Millileth
- 2pc Wanderers Troupe/Gilded Dreams + 2pc Tenacity of the Millileth
- 4pc Gilded Dreams (Only valid for on-field Nilou)
Mainstats and Substats:
A HP%/HP%/HP% build while looking for EM substats will work the best for Nilou. If you wish to burst every rotation then ER substats or even an ER sands will be needed. Another option would be HP%/Hydro%/Crit% if you want to play her as an onfield DPS that doesn't involve the bloom reaction.
Constellations:
While Nilou's constellations are tempting for a five star, she does not need any of them to function, and this includes her C6. In fact, her best constellations are her early ones such as C1 and C2.
As of 3.1, Nilou is very restricted in terms of team compositions that will fully utilize her kit. However, there are still possibilities to fully max her potential.
Team 1: 3H1D (Most Recommended)
The best units for this team are Yelan, Nilou, Kokomi, and Dendro Traveler with the alternatives being Xingqiu, Barbara, and Nahida(?). This composition can allow Nilou to play as an on-field DPS while also maintaining consistent bloom procs and heals.
Team 2: 2H2D
The best units for this team are Kokomi, Nilou, Dendro Traveler, and Collei with the alternatives being Xingqiu, Barbara, and Nahida(?). The difference in this team compared to the 3H1D is minor, but still effective as it provides safer dendro application.
Team 3: Stargust
The best units for this team are Yelan, Nilou, Kazuha, Fischl with the alternatives being Venti and Xingqiu. This composition, created with the TC while sleep deprived, is a unique team that utilizes the taser reaction. While it does not benefit Nilou's kit in full, the team itself provides sufficient DPS and has potential to make use of both Nilou's skill and burst.
Future Composition Notice:
Our TC Team understands how underwhelming Nilou's current compositions are, however one should understand that Nilou is what is known as a "late bloomer", similar to other characters such as Yae Miko and Kuki Shinobu, who had their kits truly shine much later than their release. We will be updating this section periodically!
