>.<'
I feel weird without calling him
Master Splinter. I keep wanting to "fix" my "Splinter's Dojo" shirt.
Ava has only very very recently started using "Sensei"...and she sounds silly wih her (my fake) british accent IMO

It always makes me wrinkle my nose when the turtles just call him "Splinter". Outsiders could do it sure, but even then MOST of them say "Master Splinter."