Overall, I find Koumei fairly fun to play, a lot of her kit seems to be focused around priming for CO style mods.
Her 1 can have some issues with where the threads are placed, enemies are able to walk around them if the ability isn't cast in a location which funnels them to the player, or they may stand still and just fire at the player from a distance.
Her 2 is a fun ability, somewhat useless in short missions and completing challenges can be hindered by your team. Challenges seem to be weighted mostly towards airborn kills, wall latches or kills at certain ranges, I'd like to see the other challenges like headshot kills/elemental kills more often. Her 1, 4 and passive all helped with covering any elements you were missing. There are some less useful decrees in there that can be earned/possibly detrimental depending on your weapon loadout. Being able to remove Decree after it's been earned would be helpful. It would be nice if some of the decree bonuses could scale with warframe duration like armor on finisher kill for x-seconds being extended.
Her 3 is a little questionable for her survival, it only works 50% of the time and has a 3s cooldown. She does have more base health and armor than most other warframes, so it might be worth investing into health and armor depending on what level the content is that you're playing. The ability seems like it might be useful subsumed onto something with a large hp pool and easy access to healing like Wisp if you aren't interested in shield gating.
Her 4 has really good range and hits anything in line of sight. The CC lasts for a reasonably long amount of time and holds enemies still enough that you aren't struggling to get headshot kills if that was one of your Omikuji challenges unlike some other ragdoll cc abilities.
Concept Art:
Mother - Longsword
Garren Halberd
Orengall
Orengall
Corrupted Orengall
Freed Orengall
Envoy and Orengall
Corrupted Medicant Variant 2
WIP character blocking/dodging
Character with bow next to dog/Orengall
Primeval Envoy
Halloween Sproutfolk Costume
Duck!