[Crash Ichimonji]

Jitensha did a short comic based on this concept. It was a 'Jaquelin Hyde' TF where the meek, glasses-wearing scientist girl turns into a larger-breasted, green-skinned orcish/elf girl to release her 'inner self'.

'Demon on the Dance Floor' was a Corruption TF short comic that had the seemingly underconfident girl with a modest figure dance to demonic-laced music that turned her into a devilgirl at the end, her mindset going from dreary and with low self-esteem to confident and seductive. She doesn't think she's changed any, let alone think back to her former identity, so I guess it only partially counts to some degree at best.

I wonder if the lead futanari girls of 'Dulce Report' would count in this concept? Momoe started as Momose (100% male), a kind of nerdy possibly otaku kid, then after becoming a futanari (Momoe) she became confident, more cunning, and ultimately a very responsible mother (the sequal series is still on-going). By the same token, Aoi (100% female) began as the studious and proper student council president, but after becoming a horse-cocked futanari slowly lost her own inhibitions and gave into her body's new functions (read: having a dick) by becoming rather butch in her relationship with Momoe. She was almost exclusively on top when it came to sex with Momoe, and was rather protective of her formerly-male girlfriend. In a way, Aoi's corruption did empower her, and Momoe's conversion did in her own way.

:::EDIT:::

Now that I think about it, girls that become futanari tend to get a sort of empowerment/confidence boost most of the time, though 'corruption' being a rather extreme description of a woman enjoying the sexual power of having a wang and the new pleasure of penile ejaculation.