Well... the MSLN series started out out as a spin-off of a spin-off, in which Nanoha was a typical cliché Magical Girl with Chrono as the villain and romance. Raising Heart was probably designed to be a typical Magical Girl tool, ergo... cutesy and all that. Notice the liberal use of pink, and fluffy wings.
As for why the name Raising Heart... hmm, this is purely speculation on my part, but perhaps they named it so because it is supposed to raise one's fighting spirit? The human heart is considered to be the core of human emotions. When one is said to be down, it means he is depressed.
So on the flip side, when one is said to be rising to the occasion, it is a positive meaning. Given that RH has always been offering words of encouragement to Nanoha, I think her name really fits.
Cheers.
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