Haha! Oh boy, well let’s see…
I might not get along too well with Fakir since both of us can be snarky. We’ll end up getting on each other’s nerves, but with our similar personalities I think we can still be good friends.
Mytho…well, it’s hard to say since we only see a tiny bit of his personality at the very end of Princess Tutu. One thing about Mytho is that he loves everyone and everything, and has been known to run into burning buildings to save caged birds. As someone who stresses quite easily I don’t think I can handle a relationship where my significant other routinely puts himself in mortal danger. ^^;;
Helios seem to be a sweet, gentle, and considerate person, and is a character I definitely had a crush on as a teenager. But there’s the matter of the long-distance relationship to consider. It will be hard to maintain a relationship with someone who is literately a world away, and whose duty may prevent him from ever settling down (thus much of the fodder for drama in Helios x Chibi Usa stories).
And so we have Mamoru. Hey, Naoko Takeuchi did create him to be the perfect boyfriend in her mind! And I have to say, besides a propensity to get brainwashed Mamoru has what a lot of girls look for: handsome, sweet, romantic, great with kids, and drives a cool motorcycle (I always wanted to ride a motorcycle but my family will never let me).