All your crazy theories concerning this show.

[[WMG: Leo is going to eventually fall in love with Kaoru causing friction between him and Kouga]]
Going to go ahead and say it: Leo has a crush on Kaoru. From the moment they met, Leo has had a way of looking at and interacting with Kaoru that appears rather more OTP-ish than being simple aquaintances. They spend time with each other outside of Makai business, she happens to remind him of a loved one from his past, and they even have their own "romantic" theme music whenever they are having a moment together. Add in the brush scene from ''Makai Senki'' episode 7 or the hand-holding scene from ''Makai Senki'' episode 10 (along with 90% of that ep), and it's a rather blatant ShipTease.

Its probably going to end up Arthurian love triangle, with Leo being torn about his loyalty and respect towards Kouga (and possibly some justifiable pants-wetting fear considering that his rival can probably kill him twelve different ways from Sunday) and his growing feelings for Kaoru. It will either turn into a case of LoveMakesYouEvil (thwarted in his love for Kaoru, he'll end up allying himself with the BigBad), IWantMyBelovedToBeHappy (he will gallantly step aside and do everything he can to protect Kouga for her sake, even if it means a HeroicSacrifice) or if Kouga does end up [[spoiler: kicking it at the end due to the Seal of Destruction]], an extreme, tragic case of LastGirlWins.

* {{Jossed}}. Thankfully averted with [[spoiler: Kouga defeating BigBad Sigma]] and Leo being too much of a NiceGuy and CelibateHero at this point to care.

[[WMG: Leo is the man in the red mask.]]
We know that the man in the red mask is a renegade makai priest who also happens to be a skilled swordsman, and in episode 10, we see that Leo is actually pretty handy with one. And this show has not exactly been shy about a character's seeming friend turning out to be the BigBad.
* [[spoiler: This was a deliberate red herring. The man in the red mask is actually Leo's twin brother.]]

[[WMG: Leo is not the man in the Red Mask but he is close to him in some way]]
Leo and Red Mask do seem to have a lot in common- they are both MasterSwordsman, they both want to be able to protect humans on the same level as the Makai Knights. But rather than Leo being the obvious choice for Red Mask, he is instead someone who is/was close to him. Possibly a former pupil of the Red Mask, which would explain why their principles are so similar, maybe even a former friend or relative whom he grew up and they both taught the same lore that Makai Priests were the original warriors against Horrors. But where Leo grew up wanting to support the Makai Knights, his friend/relative/mentor never outgrew the resentment he felt towards them.
* [[spoiler:If the spoilers are to be believed, he's probably Leo's brother.]]
* [[spoiler: Confirmed.]]

[[WMG: Makai no Hana will not be the story of how the GARO armour lost it's shine]]
Just so they can keep us waiting.

[[WMG: Kaoru will appear in Makai no Hana, but Kouga won't]]
His actor has apparently said he's done with GARO. This won't mean he's dead, but if he is it'll be pretty obvious he didn't die of old age.

[[WMG: The red-eyed GARO seen in Ep. 7 will become a StealthMentor to Raiga, and will be revealed to be [[spoiler: his grandfather Taiga]].]]
If only because it has been established since the 1st season that his original GARO armor had red eyes, and his spirit seems to be still roaming if ''Soukoku no Maryu'' was any indication. But then again most dead fathers (like Kengi in ''Tougen no Fue'') seem to do so.

[[WMG: Rei will appear in an episode]]
Either he's still around and helped train Raiga, or he's in the same place as Kouga and Kaoru and will return when they do