The people over at Namco really do their homework when it comes to making a character. Just look at this paragraph on what AB Blood Type people are like. This really hits the nail on the head for what Tira is like. I bold parts that really fit
People with Type AB blood are full of dualities. They seem to have the characteristics of both ends of the spectrum at the same time. They can easily switch from one side to the other. They are both shy and outgoing. They are considerate of other people's feelings, yet are strict with themselves and those close to them. They have a lot of friends, but still need a lot of time alone to think things through. They are often sentimental, but sometimes think too deeply about some subjects. They are responsible, but can't handle it when too much is asked of them. They sometimes seem to have two personalities: one for those on the "outside" and one for those on the "inside." They are quite unique.
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