Shining Games are weird but I wouldn't mind seeing more of them hit Steam tbh. A friend of mine willingly admits to the games being pretty middling at best, but still she plays them because of her infatuation with TonyTaka's art.
Personally I think he has too much sameface going on though.
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ZKenir
Somehow I pulled a Shuten with my free quartz after completing Orleans campaign.
Now we save for Mama Raikou return!
What servants should I raise for Onigashima?
Gratz on
drunken kansaiben Aoi Yūki Shuten!
Onigashima has some servants getting bonus for being japanese, that said thanks to the +dmg CEs of the event even regular servants are obscenely strong, keep in mind you get Rider Kintoki for free which is Japanese but needs to be leveled up + ascended with the event materials.
The main stuff of the event are the 3 oni raids + the Ushi Gozen raid,
The 3 oni are all males so Euryale is devastating with the bonus damage CEs even the Blue oni that resists to arts (plus you can negate resistance or increase damage with the event-items).
Ushi Gozen is a zerker so you can wreck her with anything, Kintoki is a good choice but I forgot if you get him to a decent level by then.
Even if you wipe you still the damage points added to your score to climb the damage ladder, and you need 100 millions to get the ascension mats for Kintoki.
I would level up Euryale if you have her since she's good in an arts team with a friend waver or Tamamo, besides her it really depends on what you have and what you have access through your friendlist.
Gamepress might help with both walkthrough and choice of servants for the bosses:
Revival: The Great Tale of Demons Onigashima
Revival: Onigashima Raid Boss Guide
You are starting from scratches but the event should be easy with all the +dmg stuff flying around,
edit: personally outside of Merlin and Waver I'll be rotating my support list depending on the boss
Green Oni - Medb or Kintoki (he should still be able to melt the boss)
Blue Oni - Orion
Red Oni - Shiki or Jack (probably Jack since she's NP4, gonna see whichever kills it faster)