Okay ... I didnt think you would be so clueless.
First of all do you actually know the reason why you use Vohu and you should MT her? I guess you dont know it.
Next year we will have the Era of Shingen fast burst builds.
Furthermore you can use MP to unlock her 20BG Party skill with 6T CD.
Then how are you going to burst fast in 3-4T with PF and a team with Cthulhu, Ryu-Oh and Snow Raphy? You can't!
What does Vohu do?
Abi 1: AoE Water damage + GTA (Guaranteed Tripple Attack) for 2T. CD: 10T
Abi 2: Consumes 10% HP and you can attack immediately. Every 4T (add Tiara set effect + Sarsawatis help = she will sure DATA even without her GTA skill)
Abi 3: 30% Fire Atk down and 30% Water RST down --> you need 30BG to use it
Passive: At the end of the turn 5% chance that her skills will reset by 1T
Burst: Recover 2k HP.
With Vohu you can kick Snowy and Ryu-Oh. Especially with Cthulhu AW and she is fast after burst, if you use her Abi 3 because GDATA!
Now we need someone that can help Vohu after her 2T --> Sarsawati, who is basically like Titania.
Shiva AW will replace Ashy. Why? Shiva AW has a better party buff skills and only 5T CD! Furthermore she get 20BG every 5T for herself + her Nuke is strong enough to make up for Ashys Buff loss.
Shiva AW, Cthulhu AW and Vohu are the water meta.
Last spot is either Lakshmi for more damage and MVP stealing or you use Sarsawati/Poseidon AW --> depends on the situation.
Furthermore Lakshmi herself if fast enough!
Tbh that you are really saying that she is "really good" against fire and nothing-else is Bullshit.
She is basically saving water from the extremely debuff heavy curse.
I dont know why you think that you should use 2 useless slow KHs instead of Vohu in off-ele...