Sidmith Sogginton, known under the alias of Soggy Sid is Henry's gym teacher who works at the school. He is also dance partners with Miss Battle-Axe. He is shown to be very mean and impatient. He also plays as the tertiary antagonist of Horrid Henry The Movie

Despite being known as Soggy Sid, he has only taught swimming in one episode, Horrid Henry Goes Swimming. No students liked him at Henry's school. He is also the school bully despite being an adult and in Series 4 he hates Henry even more.