Something I noticed recently… with Mytho, love is heavily associated with self-sacrifice and self-destruction.
One of his most important character traits, the one that sticks even when his heart is gone, is his desire to protect people, even when that desire leads him into dangerous and painful situations. (Rushing into a burning building to save a bird, hurting his leg in the process of catching Duck when she falls.)
When Mytho’s corrupted by the raven’s blood, it’s almost like he’s demanding reciprocation for that self-sacrificing spirit: I’d give up my life to save you, so you should be willing to give up everything for me.
And while we don’t ever actually get to see what happened in the Prince and the Raven, a lot of the story seemed to revolve around people destroying themselves for the sake of Prince Siegfried’s love: The people of his kingdom fought for it, making them easily exploited by the Raven, the Prince’s most devoted Knight died trying to protect him, and Princess Tutu effectively dies when she confesses her love.
But then when Mytho gets to the world of Gold Crown Town, things get a bit complicated. Neither Fakir nor Duck want to die for Mytho, although they undeniably care about him. And as Mr. Cat says, “You can’t marry on that feeling [Of being willing to die for someone] alone.”
It’s really not that big a surprise that, when the battle with the Raven starts going south, Mytho’s grand plan is to shatter his heart again just so he can go through gathering it back up, re-fighting the Raven, and then killing himself afterwards. And the show doesn’t hesitate to portray this as a terrible plan. (Certainly, things would have turned out much worse for Rue and Mytho if he’d gone through with it.)
The message seems to be that “Self-sacrifice is all well and good, but it’s not the be-all and end-all of love.”
I guess that also explains why Fakir was so frustrated and a jerk about Mytho’s self-destructive sacrifices, and stopped Princess Tutu from confessing her love in front of Kraehe. (Well, I never noticed it until this analysis) He knows the consequences of self-sacrifice because he is the end result of it.
His own parents died by sacrificing themselves to protect him and as much as it shows their love for him, they are dead. They can no longer be with him and it left him hurt and lonely. Then seeing Mytho going around, casually throwing himself into danger and almost dying from his crazy antics, probably drove Fakir crazy. He wants see people live. He doesn’t want anymore people dying or getting seriously hurt, when there could be better ways to handle it. As pure and well intention as it is, sometimes it causes more trouble than its worth.
Then the scene where Princess Tutu/Ahiru was going to speak her words of love and turn into a speck of light, basically sacrifice herself; Fakir stops her because he knows it’s not going to help even Mytho in the long run and he outright says its stupid.
Funny how later, he stabs his hand and wants to rush into the attacking crows to save Ahiru. :P (Though it was last resort)