Today I want to talk about Plana's hair. I will have to go into detail about story events, so I will spoiler when necessary. Read the story, Sensei.
Plana has long white hair that goes down to her upper calves. Her interior hair is a very faded pink, almost like there was once color there, but it's since faded. Like Arona, she wears a bunny-eared hairband. Unlike Arona, though, her hairband is skewed to the right as opposed to slightly to the left, as well as being off-center- her hairband is also black, as is the little circle in the hairband. This is a case of differing appearance, though, since their halos, despite being in different colors, are in the same position. Plana's bangs obscure her right eye, while Arona's eyes don't have this same covered eye. It's a very good dramatic touch to reveal her other eye to show that this is a truly equal battle. Unlike Arona, her braid is on the right side, compared to Arona's left- there's a lot of mirroring between these two, yet they're very clearly different. It's very cute how these differences stick out more because of the similarities. The GSC President is also an important piece- if Arona has her hair color and left-leaning accessories, then Plana has her length and to a lesser extent, her clothes. Also, something that's very distressing is that Plana's serafuku has a ribbon length not too dissimilar to her hairband...
My personal favorite difference between the two is that Arona's gun has a little whale accessory on it, while Plana's doesn't. Despite her lack of accessory, she still has something that would perfectly fit such an accessory.
Plana's hair is ironically harder to determine than Arona's- Arona is definitely a strawberry hair. I'm pretty sure Plana's hair is a nice scent, yet there's a floral undertone to it. I think that's lillies, chrysanthemum and orchid? I might be mistaken, though.