On top of this, Ghidorah is able to absorb any form of energy around him, electricity in particular. This means that while in the thunder strom he will constantly absorb the lightings and become more and more powerful. The boost given by the Energy Absorption is quite impressive, considering that after absorbing a small quantity of electricity he goes from being to being inferior to Charged Godzilla to completely stomping him with no difficulty.
Then, we also have the powerful winds created by the flap of his wings. By moving his wings, he is able to create gust of wind that are so powerful that he is able to drag the entire storm with him thanks to them, and he was also using them to spread the storm on a global scale.
And the storm in itself is powerful enough that it would have terraformed the entire planet, if he wasn't killed in time.
This means that if Ghidorah brings the fight to the sky he will have a big amounts of advantages, considering that Maka will be destabilized by the powerful winds and wont be able to move properly, making her vulnerabile to his attacks while he will become stronger and stronger the more he is in it.
All of this is especially very dangerous, and Maka would normally have no counter to them, except with Maka's Soul Sensing, they will be able to read his soul and realize that if they don't go 100% from the start, then they'll stand 0 chance.
At that point, it's VERY likely for Maka to start in Black Blood Armor, and Soul Resonate with Soul to amp their Stats (AP, dura, speed, cutting power). And Soul, will ALSO continually amp her due to the effects of him playing the piano.
They'll likely not go close (yet), seeing how high the chance of getting electrified is, so Maka will just keep her distance for the time being, also amping herself, much like Ghidorah.
And for the Kishin Hunt, how does that work and how much in character is to use it?
It's not really in character. She only used it as a last minute option, cause all of her other options had no chance against Kishin. Much like that situation, she really has no other option here (outside of her Empathetic Manipulation which I'll get into later).
And how would that work against a character that have Multiple Selves? Because if she is not able to affect multiple targets at once it might be partially useless.
She should be able to cut multiple times in a row,
much like she does with Witch Hunter.
If I remember correctly from what I read a long time ago regarding Soul Eater, Kishin was deafeated by sealing him away, so there was no need to go past his Immortality and Regeneration, which would be coherent with the fact that Immortality Negation and Regeneration Negation aren't in her profile.
Correct (which is why her profile needs to be redone). If I recall correctly, it was Death himself that stated that Kishin Hunt was able to defeat Kishin himself (who has Immortality/Regen on his profile), so it either negates, or completely ignores Immortality/Regen.
Regarding the Emphatic Manipulation and the Madness Manipulation, how does them work? And how would that work against a character that have Multiple Selves? Because if she is not able to affect multiple targets at once it might be partially useless.
Her Empathetic Manipulation hits her opponent's soul. Her Planetary Range + Soul Perception will allow the ability to tag Ghidorah, completely nulling his bloodlust and keeping him in a trance like state.
Then she'll very likely use Kishin Hunt to finish the job, because of his immortality.
As for Madness Manipulation, she stole the ability from Arachne. She uses webs which surround her and expand from her, with the help of Soul, she extends her Soul Wavelength that instills Madness into the web. Anything that is in the web will then go crazy.
She's more likely to use her Empathetic Manipulation than her Madness seeing how her actual opponent is pretty Animalistic in Nature, and causing it to be crazy or mad doesn't really benefit her here.
If the fight remain in the ground, both have good chances of winning, but she will be extremely careful to not being caught by none of his lighting nor being taken by his mouths, while also dealing with winds that can destabilize her and an opponent that is extremely durable and thought to kill.
If the match remained on the ground, then I do think Maka has a far far better chance of winning, due to her actually being able to use her full kit.
Black Blood regen, offensive, and defensive capabilities, Soul Perception, Soul Resonance, Soul Chaining Attacks with Witch, Demon, and Kishin Hunt, Madness and Empathetic Manipulation, etc etc.
I'll cast my vote for Maka for these reasons.