Nothing will get her to turn.

This is why being a mahou shoujo is tough shit.

The mascots! They have multiplied!

At least the other two are more honest. And less creepy.

"And even all the mascots of every Pretty Cure series couldn't convince the Madoka to do it."

Less creepy? Yuuno "forgot" to tell Nanoha he was a human male and hung out in her room even while she was changing.

If she picks Kyubey, she has to pay with her soul.
If she picks Kero, she won't have anyone making her magical girl costumes.
If she picks Yuuno, she will be as dangerous as witch. XP

GloomMouse said: Less creepy? Yuuno "forgot" to tell Nanoha he was a human male and hung out in her room even while she was changing.

When they first met, he was badly injured, and then they were fighting for their lives, and he had to tell her a LOT of stuff very quickly. It slipped his mind that "Hey, I'm human" wasn't one of those things.

So all that time, he just thought she KNEW and didn't care. But when she changed, he turned his head away, anyway, and he was terribly embarassed about the bath-house thing.

GloomMouse said:
Less creepy? Yuuno "forgot" to tell Nanoha he was a human male and hung out in her room even while she was changing.

Kyubey is an expressionless plushie who doesn't tell the people he recruits that the power he offers cuts life expectancy by more than an order of magnitude, and will turn them into the very monsters they fight if they aren't killed first.

Yuuno is a(n apparent) ferret (actually a more-or-less normal human transformed) who forgets to tell the person he recruits that he's actually a prepubescent human male.

I think it's pretty clear who's more of a lying creep here.

If Kero exists, then Clow Reed and Sakura exist.

If Clow Reed and Sakura exist, then Kyubey is the award-winner for abject failure at finding the most effective/efficient method of harvesting magical energy.