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|Relatives|| Souhei Shiina (grandfather)|
He is a baby with short brown hair and maroon eyes.
Tsukushi exhibits typical behavior of a baby and, on the whole, appears to be happy. He recognizes the faces of people who interact with him and has been known to show preferences for certain individuals. This is seen in Free!-Dive to the Future- when Tsukushi fusses while being held by his uncle, Asahi Shiina, but calms down after being handed over to Ikuya Kirishima.
- He is the first infant character in the entire Free! series.
- Tsukushi's English voice actor, Colleen Clinkenbeard, also provides the voice for Mrs Tachibana and Makoto Tachibana as a young child.