Maya has pointed that Tatsuya isn't human, but it's just nonsense to assume they wanted a robot based on the previous posting. Quote: [Volume] 16 when Katsushige said himself that they gave him Flash Cast to allow him to use magic. ... Tatsuya, as any other magician, needed time to develop his magic capabilities.

Is Shiba a robot?

The Aiken Shiba-chan is a robotic version of Japan's most famous dog, the shiba inu. He can interact with you through 85 different patterns of behavior.

How is Tatsuya so powerful?

Tatsuya is a Supernatural Power User. As a Supernatural Power User, Tatsuya can apply his Psions to directly cause phenomena through will alone. Because this is done without an Activation Sequence, he gains overwhelming speed while sacrificing the versatility of systematic magic.