There are indeed such fanfictions. The idea of combining the two characters in this way can lead to some really fascinating plotlines. For example, Harry could start to exhibit some of Ulquiorra's cold and detached behavior, which would be a huge contrast to his normal self in the original series. This could cause all sorts of chaos and confusion among his friends at Hogwarts. And the way the author might describe Harry's new appearance, similar to Ulquiorra's, could add an extra layer of intrigue to the story.
It could be offensive depending on how it's meant. If it's said with a dismissive or negative connotation towards the idea of black - influenced interpretations or fanfiction in general, then it's offensive. Fanfiction is a creative outlet, and black - centric interpretations can add new and valuable perspectives.
Well, if fem Harry looks like Lily, it might lead to all sorts of new plot developments. It could influence how she's treated by certain characters who knew Lily, or even give her some of Lily's personality traits.
Well, a major theme is often the exploration of duality. Harry has his own set of values and characteristics from the Potterverse, and when combined with Ulquiorra's from the Bleachverse, it creates a duality within him. This can be both physical and mental. Another theme is the idea of outcast. If Harry starts to look and act like Ulquiorra, he may be seen as an outcast in the wizarding world, which was already a bit of an outcast to the Muggle world. And then there's the theme of mystery. The readers are often left wondering how far this transformation will go and what the ultimate outcome will be for Harry.
In some fanfictions, Harry might be described as having his mother's bright green eyes, which were said to be very expressive. Also, he could have her delicate facial features, like a small nose and a soft jawline. Maybe his hair has the same texture as his mother's, which could be a bit wavy.
In an anime fanfiction, Harry Potter might have some really cool anime - style visual changes. His magic could be depicted with more flamboyant and colorful anime - style special effects. For example, his Patronus could be drawn like a beautiful, glittering anime spirit animal. His Hogwarts uniform might be designed in a more anime - inspired fashion, with exaggerated collars or unique patterns.
One common theme is identity. Since she looks like Lily, fem Harry often has to grapple with the expectations and assumptions that come with that appearance. Another theme is relationships. Characters may be drawn to her because of her resemblance to Lily, which can create complex love triangles or strong platonic bonds. For example, Snape might have a different dynamic with her compared to the original Harry.
Yes, there are probably some out there. You could search on fanfiction websites using keywords like 'Harry Potter looks like Lily' to find them. But it might take some time to sift through all the results.