Talk:Minamoto no Raikō/@comment-667468-20180626110808/@comment-26984863-20180626125731

I'm no pro, so take my word with a grain of salt.

Waver goes well with anyone, so that's a given. But you're going to want to pair Raikou with people who can give her crit stars (i.e. Jack, Sasaki Kojiro, Okita, Kintoki Rider) so she can suck them up with Eternal Arms Mastership to go ham on your next turn. Servants who are able to protect her with taunts, defense buffs, or heals like Nero Bride, Mashu, Irisviel, St. George, and Chevalier d'Eon are also worthy picks because she's still squishy as a Berserker and will go down if focused hard. Attack buffs are always welcome to up her already impressive damage. Servants that increase NP Gain or NP Charge like Xuanzang, Nobu, and Ushiwakamaru are also helpful for farming.

Skill upgrade priority is probably Mana Burst (Lightning) (Most reliable skill and lowers the cooldown on the dodge) -> Mystery Slayer (Strong damage bonus against a wide variety of enemies) -> Eternal Arms Mastership (Level 1 or 2 should be more than enough to give Raikou crit weight dominance unless you're running Riders).

CEs should be targeted at increasing her already bountiful damage. Black Grail and Kaleidoscope are excellent for clearing mobs, Limited/Zero Over increases her Buster damage dramatically, Golden Sumo increases her damage and gives her some NP charge at the start of the battle, and Teacher and I gives her both crit star weight and NP charge.