I like your build, honestly I think the Merciless 4 piece is better than the Relentless setup I have and I might switch to it. If I get Merciless Accessories, I'd combine her Relentless and Merciless together if I could. This is mine and she's mainly used in Hydra, Sand Devil and any City stages that allow her 

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Do you use her in Arena at all? That's my consideration for the Stoneskin mostly. 

If you want Stoneskin, I'd go Stoneskin (with 2 Accessories) & 1X or 2X Perception.

Otherwise, I'd probably go full-on with speed and accuracy.  

She isn't really a damage dealer, so the Merciless would be mostly wasted on her, IMO.   

nothing wrong with 4 piece merciless - especially in a hydra setting. very far from a waste and often quite good on champs we need to cycle through their skills often. enabling a little extra damage isn't a negligible thing, either. just strictly better than reflex on a lot of champs IMO. 

Honestly, I have her but I have yet to build her. I can't really figure out what spot she'd fill. For those of you who do use her, who did you use before?

I don't have her yet, I just can't seem to pull 2 of the epics needed, but I find her *super* annoying to fight in arena, where I usually see her high speed/high acc cc'ing my team.

Mikage is straight up incredible in arena & hydra. easily one of the best champs in the game now. 

hydra you lean heavily on her first form and A2/A3 and she can essentially replace needing a duchess/veil or shamael in the right teams with the a2/passive.

she's great in LA right now, arena in general. just an absolutely nuts control kit. 

Yeah Arena I definitely see the value, but I'm not concerned with that for the time being.

In Hydra, I don't think she can replace Duchess on my current team - currently Razel, Duchess, Kantra, Uugo, Rathalos, Artak. Though if you look in that other thread with my roster, I'm certainly open to a new team built around using Mikage.

I don't have her in my Live or regular Arena teams, she's on one of my Tag Teams. I use her alt form to strip buffs and stun/lower turn meter on turns 2 and 3. On turn 1 she's awesome with her Team Up because if they have UDK, it doesn't matter, everyone will attack whoever you tell them to and he'll only take the first hit.

Yeah I love her in Hydra but I only keep her in base form. That A2 and A3 are so good that I don't see the point in switching forms. Especially that A3, it's a Head Killer since its SIX people attacking one head together (and they all get two great buffs beforehand)

I fused Mikage during the Wixwell Champ Chase.  She is currently doing runs in Minotaur.

I will probably figure out a spot for her in Hydra, but my first goal with her is Live Arena, which is why I lean to Speed & Accuracy as the primary stat targets.

Merciless is certainly a top tier set, but I intend to prioritze speed.  

If you have harima, put on team with mikage

I try to have Harima & Siphi every fight, but the opponent sometimes disagrees. 😂

Hydra can't ban one :)

The fact that a Shadowkin will always team up on her A1 is amazing (Though I don't think it procs from counterattack) so on my Tag Arena she's with Genbo, since his A1 hits hard and steals buffs. Like Trips said, Harima is a great option too. Mine isn't booked yet but AOE Decrease Atk on Harima's A1 is great too

She's incredible in 4 piece stoneskin. Ensuring she gets a turn versus Armanz or teams that outspeed you and get a nuke or CC off, that's what you want.

I've seen big success with a very fast, high accuracy Stoneskin Mikage in Live Arena and in Tag and Plat push.

Her ability to ignore a lockout by transforming and then stunning a whole team is super strong. Then she can sleep the nuker or reviver that is most dangerous until you get your nuker abilities back up again. 

Stoneskin Merciless would be great if you can find enough accuracy. Nothing like giving your controller bonus turns to be annoying. But I personally ended up using 4 Perception , 2 Stoneskin artifacts, 2 Stoneskin Accessories and 1 of those can't crit me first turn Reaction Accessories just as an added bit of RNG if my Stoneskin gets stripped and she doesn't sheep.

Nice.  That sounds exactly like the build I have imagined for her...whenever she finishes her Mino Runs.