Youmu is one of the stranger entities in Gensokyo, part-human and part-ghost at the same time. Her two halves are not intermixed like one would expect from a cross-breed, but actually exist in physically separate bodies. Youmu has a straight-forward and focused personality, which complements her swordsmanship abilities well. However, her personality conflicts with that of her master, Yuyuko Saigyouji, who is very whimsical and playful in nature. Still, she serves Yuyuko as best as she can, tending to the gardens in Hakugyokurou and following her orders. Youmu commonly wields two blades at once, having studied some under her father, Youki. The longer blade, called Roukanken (Tower-Watching Sword) is said to be able to kill ten ghosts in one swipe; the shorter blade, Hakurouken (White Tower Sword), is able to cleave through a person's own confusion. However, not much is known about her particular style of swordsmanship, or her parents. What is known is that Youki, also a servant of Hakugyokurou, had begun training a very young Youmu when he suddenly disappeared one day, leaving her style incomplete. No one currently knows his whereabouts. (Source: Touhou Wikia)
An intelligence broker who helps Odajima dig up information on Reiji.
Hana Arai is the second main lead and deuteragonist of Hana to Alice: Satsujin Jiken. Alice ends up trespassing into Hana's house as she seemed to be part of the key to solving this "Juda" mystery. Hana is a far more observant and thought-out person to counteract Alice's propensity to jump into any situation without much thought, at the mercy of her own whimsical nature. This isn't to say that Hana herself isn't a whimsical person; she very much is, she just keeps herself in check most of the time. Where Alice is comparatively idealistic and childish, Hana is more than a tinge jaded, cynical and a tad bitter. Hana expresses most of her cynicism through deadpan humour; she is a deadpan snarker. As it turns out, Hana dropped a bee down Juda's shirt on a whim because she felt irritated with him, which ended up stinging him and giving him an anaphylactic attack. This event ironically scarred Hana more than Juda, as she isolates herself to her house for most of the time after said event. It's likely because of this experience that Hana decided to keep her whimsical nature in check and think things out a lot more thoroughly before doing them; she contents herself with sticking at the sidelines and observing things before making a move; she represses herself. It's through her interaction with Alice that she starts to rediscover a lot of her whimsical nature comes to light again. Alice pushes Hana forward again by forcing her to interact with Juda, as opposed to running away from her problems (i.e. Juda). Hana's relationship with Alice allows her to grow as a person and confront the things she was previously unable to face head-on; she gives Hana the strength that she can't summon on her own. Because of this, Alice becomes an important friend to Hana by the end of the film. (Source: Hana to Alice: Satsujin Jiken)
The leader of the delinquent gang at Eisen Private High School. He has had trouble remembering names since he was little. When he first appears, he tells the new students to call him senpai to show the proper respect to seniors. While he has a menacing appearance, he often helps people out when they need it. He makes a cameo appearance in Adachi's more recent work, Cross Game, where he is a boxing club member who is interested in Aoba Tsukishima, but the story is completely unrelated.
"Born as the first battleship of the 8-8 fleet programme, the nameship of the Nagato-class battleships, Nagato. Until the Yamato was entered into service, I served as the flagship of the combined fleet. I was called one of the 'Big 7.'" - Nagato (Source: Kancolle Wikia)