Y'know, everything I've read refers to "Ryuu taichou" or "Captain Ryuu". But technically it really should be "Aihara Taichou".
This thought brought to you by being annoyed by writer's block.
It occurs to me that Ryuu kind of gets the suck end of the stick at the end of the series. Everyone else goes back to their normal old lives. Even Mirai goes back home to his old life. (Sure, with a different understanding on stuff. But still, his old life.) Ryuu's old life got blown up in the first episode, and his rebuilt life all goes home at the end of the series, leaving him to put everything back together yet again.