Why is Ryuunosuke Akasaka's hair so long? It makes him look like a girl. Is there some explanation to that in the series besides this being a possible consequence of being a hikkikomori?
Also, Maid-chan (the AI created by him) has a similar appearance. Ryuunosuke said that he wants to turn her into a real person (sentient AI?) one day. I suspect this may be related.
Also! Ryuunosuke has gynophobia (he's so afraid of females). This might also be the reason (in a way).