Doing anything half assed will leave your students confused & disrespectful or at least bored & unimpressed. None of these states is likely to get them motivated.

Presenting a single, simple, clear personality is what you need to do. Trying to be some strange malange of Bozo and taskmaster will make them think you are a schizo.

I suggest that you get together with your fellow teachers & choose a stereotype for each of you to play.

Just put slips of paper in a bowl & whatever you grab is what you play for the whole semester.

Here are ALL the selections:

Bozo (the REAL Bob Bell version)

Disiplinarian (Standard issue British, like in The Wall)

Seductress (Van Halen-Hot For Teacher or Elizabeth Hurley in Bedazzled)

Super nerd (Thick glasses, tweed jacket with leather elbows, out of style tie)

Nanny (Like Mary Poppins or Sherry Bobbins, turn everything into a song)

Kool Guy (Hep to all the new bands, casual clothing, bring a guitar)

Genius Professor (Loud talking, Einstien hair, wild gesticulations when making an important point)