i accidentally chose Eirin for the AI civs twice and she really does not like herself.
Eirin as an AI tends to be a powerhouse and if there is anything a civ AI powerhouse doesn’t like, it’s other AI powerhouses.
I’ve actually never seen AI Eirin accomplish much. It doesn’t seem to abuse her specialist/GP bonuses to the absurd degree that human players can, so she usually ends up middle of the road. If I play with all Touhou AI civs, Alice, Nitori, or Cirno are usually in a strong lead, Keine, Kanako, Eirin and Mamizou can do alright for themselves, Remilia sits in a corner for the entire game and does nothing, and Okuu either conquers her entire continent by 1500 AD or pisses everybody off and ends up in last place.
All of that sounds 100% accurate, even if it excludes poor Shinki and Yumemi.
Do find that Suika and Yukari are rarely successful, by the way?
That said, here’s King AI Eirin in the game I played as Remi where I never built world wonders.
Eirin does usually do decent at science by AI standards, so yeah, I can definitely see her going runaway in the right circumstances. I don’t have Shinki, Yumemi, or Suika installed. I should probably install Suika, but her civ bonuses looked kinda bland. Still, it would be a decent change of pace, I guess.
But yeah, Yukari is in the ‘sits in her own corner and does nothing’ tier with Remilia. In my current game, she’s something like #3 by score, but that has more to do with her starting on her own personal continent than her civ. Usually, she’s a strong contender for ‘least successful civ that hasn’t been mostly conquered.’
I keep meaning to try playing her myself, since I’m pretty sure that her indirect fire bonus is the kinda thing the AI will never succeed in exploiting, whereas I think I could do terrible things with indirect fire Catapults, Trebuchets, and Cannons. Then I remember that I could instead play with Alice’s completely broken Doll Lumber Houses or Eirin’s absurd specialist/GP setup, or Nitori’s ‘as long as I start near a river, I will be an age ahead of everybody else circa the Renaissance’ science bonuses, or Okuu or Remilia or Mamizou or… yeah. In player hands, pretty much everybody (except maybe Keine) is broken in their own way, but I find Yukari to be the least interesting brokenness.
Suika is actually getting reworked by bouncymischa after I suggested that she be looked at for a revamp (because I found her to be quite unsuccessful compared to Nitori and Utsuho), and especially now that there’s a mod in beta that sort of ports the EU4 events and decisions. (She definitely isn’t anywhere near as interesting as bouncymischa’s later work right now.)
While aranicar still exists (he even has a blog on tumblr >__>), he doesn’t seem to be involved in his three pack anymore, so Yukari’s unlikely to get buffed by him. (And Alice and Nitori aren’t likely to get the slight nerfs they need.)
Eirin’s bonuses actually came up as a balance concern, and Huitzil says he’s looking to rework her a bit. I might see how stupid an abuse of the great tile improvements I can do before he does that.
Also, you might be interested to hear that civs based on Yuuka, Yuyuko, Mima, Marisa and Reimu are at least planned and partially complete.
I’ve actually played a game as Marisa and it was pretty great.