Say said zombie hoard (or whatever) was hiding around a wall. Have the new flame creature go around said wall to say "hello"

You could likely also wrangle out things like intimidation tests etc from it. Say the locals are looking hostile, but they're more than a little primitive/dumb/etc and are coming for you not looking too friendly. Suddenly GIANT FIRE SNAKE and they may well run off screaming.
Don't forget, it's a roleplay, not a rollplay. Some things are there because why shouldn't they be, rather than there for mathematical usefulness.