So, apparently the other match has finished yet, but I guess we can still vote here.
I guess this is base Ryu and is capable to tranform in both Evil Ryu and/or Power of Nothingness. At glace Ryu seems moderatly better at melee combat, but Magilou has more powers but I do not known how they works.
Ok, since I'm going to sleep soon, I'll post as much relevant info as I can and leave it up to everyone from there. Also it would be nice to know Ryu's AP. Magilou is >24 Megatons, as I said before.
First, how she fights:
She generally fights by casting magic from a distance and, while she may not take things too seriously, in a fight to the death she will fight to the best of her ability, she isn't a close range fighter so moving away or casting a spell right away is fairly likely.
So, some relevant abilities:
Gravity Manipulation: It's the type that holds you opponent in place while you're free to do things, she can set traps that do this too, with Gravity Mine.
Life Manipulation: A property of many artes in general, she gets healed while fighting
Summoning: She can summon the spirits of 49 normin (A type of malak, comparable to her) and rain them down on the opponent, she can also summon Guardians, a type of paper creature that she can also fly around on like a hoverboard, they can also change sizes
Stat Amping/Reduction: This one is actually fairly relevant, it's at least 50%, I believe it can go up further, it's a property of most of her attacks, it works on enemies when hit and on herself when she casts, so Ryu might, say, find himself suddenly losing 50% of his physical strength or Arte Attack (In this case, that would mean techniques like the Hadouken), also, she can slow down the opponent fairly significantly (About 4x)
Poison Manip: It's there I guess, a property of some artes, it damages over time.
I guess with range advantage and AoE Magilou has the advantage here, Ryu is only efficient at melee. Ryu's intangibility is futile and with vastly amounts of spells and summons the girl overcome. Without being at melee range most Ryu can do is counter with Chi attacks.
Yes, but he can't send out nearly as many projectiles from range.
In addition, in a situation like this, Magilou is fairly likely to take to the skies.
I'm voting Magilou, Gravity can hold him still while Summoning and other spells overwhelm him, all the while he is being weakened by the effects of those spells and Magilou only gets stronger with them.
She jokes around normally, but takes fights seriously unless there is some reason for her not to. She might throw out some one liners while fighting but that's about it. Her carefree attitude has never caused harm to her in battle and she can take fights very seriously when they are life or death situations.