Youmu Konpaku (Mysterious Sword Master)

"Some call me a master of the sword, but I am merely a vagabond without a master to serve."

The Mysterious Sword Saint, this version of Youmu Konpaku hails from a world which seemingly entirely revolves around the Netherworld. Those from otherworlds are abducted by some force and brought to the Hakugyokurou Arena, where they are forced to do battle for their lives once the bell in the middle tolls, to appease the Saigyou Ayakashi. Youmu’s duty is to facilitate this, and to slice down the losers so that their life force may be fed to the tree. As much as she hates this duty,  she has gotten very good at swordplay over the many years spent watching the arena alongside the Yuyuko Saigyouji of her world. So good, in fact, that she’s a S+ Tier Friend.

For farming purposes, Youmu possesses an extremely potent All targeting Last Word which deals a tremendous amount of damage (much more than you would expect from a 1-2-2 layout) - with a rather strange elemental distribution. To a extent, this isn't an enormous problem - it's rather Metal heavy, so you can consider Metal to be the weakness/resistance for her to watch out for, and her passive does at least partially mitigate the damage penalty that enemy resistances incur. Still, it’s worth keeping in mind her effective farming damage isn’t quite as high as the raw numbers might suggest since she’ll pretty much always run into at least one foe resisting at least part of her damage in multi-enemy scenarios - but it’s still extremely high even with that in mind, and she should be able to handle just about any Lunatic difficulty event stage. For boss farming, she can do both Chapter 3 Act 1 and Chapter 3 Act 2’s farms, single handedly at that - but it requires manual play.
Solo Stage Farms: 2-7-1, 3-3-3, 3-6-3, Future Story Card Stage

For harder fights, the Mysterious Sword Saint has one job in mind: cut down all who stand before her with the devastatingly powerful All targeting Combined Sword - Cherry Blossom in Full Bloom, one of the most damaging Last Words in the game. It already has the previously mentioned 1-2-2 layout that makes it stand out in harder fights, but it also possesses a great 80/140/100/100/120/120% Slicing, which means 80 to 140% (depending on the bullet) of Youmu’s Agility will be factored in for damage calculations. Due to the tremendous amount of ATK UP and AGI UP that she possesses, this results in a Last Word which deals some of the highest damage in the game. 

The half-phantom’s damage output doesn’t end there though. With the extremely high ATK and AGI UP from her skills, which also have 3 turns of duration on top of her Spell Cards having 3 turns of ATK and AGI UP as well to refresh them, the Sword Saint can use her Spell Cards to inflict damage even before she uses her Last Word. They also possess rather great Breaks. In total, for her attacks: Dream Thrust features 1 Solo targeting Metal Break for 0 Power, making it a spammable way to perform Metal Breaks. Additionally, Origin Mystery: Sohaya-Roukanken features 3 Solo targeting Fire and Metal Breaks at 3 Power total (meaning it will usually have at least one or more targets to have 3 Breaks against, sometimes even 6). It also has Incineration, but Burn barriers are rare and you typically don’t want to break them. Lastly, Origin Mystery: Raikiri-Hakurouken features 3 All targeting Wood and 3 Metal Breaks for 3 Power - which as always, is a fantastic spread to have on an All targeting Spell Card, since it increases the chances of getting more Breaks out of it. It also possesses Discharge, which can be potent when paired with Paralyze inflictors. As an addendum, her Last Word also features 2 Fire, 2 Metal, and 2 Wood Breaks at 3 Power, should you ever decide to use it to Break rather than do damage.

There is one flaw to the Sword Saint - she’s purely a selfish damage dealer, so the only way she’ll be supporting her team is by Breaking. Still, hard to argue with how much damage Youmu does - just make sure not to be alone near her when any bells ring. She might decide it’s time for a fight just out of habit, and you don’t want to be on the other end of her swords! She's so powerful, she even cut her skill names in half...

Her secondary effect chances and Slicing values are as follows: 

Phenomena Slash: Chance for Agility UP: 30%/0%/0%/0%/50%/0%

Dream Thrust: Slicing: 15%/0%/0%/0%/20%/25%

Origin Mystery: Sohaya-Roukanken: Slicing: 30%/0%/15%/25%/0%/40%

Origin Mystery: Raikiri-Hakurouken: Slicing: 20%/15%/15%/30%/30%/50%

Combined Sword - Cherry Blossom in Full Bloom: Slicing: 80%/140%/100%/100%/120%/120%