While he doesn't initially appear to be much more than friendly and easygoing, Q-taro can be incredibly selfish and prioritizes his own survival over most other things in the Death Game. He's easily manipulated by anything that would secure his life (ie. tokens) and rarely acts in a way anyone would call "selfless" during the Death Game.

He is also very anxious about many situations in the death game, as evidenced by his need for a lengthy debate to decide the Challenger during Russian Roulette. His fear and anxiety drives him to do even more impressively selfish things, such as taking the solitary-escape in a bad ending.

Further contrasting his appearance, Q-taro is actually rather intelligent. While probably not academically gifted, Q-taro is good with people and can make them act in ways that benefit him.

This is demonstrated in the second Main Game, where he collaborated with Keiji on a plan to ensure their survival that possibly even fooled Shin.

Another notable example of Q-taro's social intelligence is his accusation of Kanna, Gin, and Nao of being useless in the first Main Game. Due to the accusation, Gin and Nao both proved their worth and avoided being chosen in the preliminary vote. This was very likely Q-taro's intention, as he is visibly shocked when Kanna decides to accept her death.