The MI6 is troubled by the possible existence of a voice technology that could recreate all human speeches ever made.

But I would readily think pointing out a protagonist in the logline for a story with a complex plot would make it sound like a cliche.?.

Not if the protagonist isn't a cliche.

Do not fear cliche. It means you're on the right track. The important thing is *identifying* you've got a cliche on your hands. Then you can write something to *overcome* the cliche... which as a creative process I tend to find this to be an extremely fun and rewarding process.

"A middle-aged male MI6 agent with marital problems" - Cliche
"A 60-year-old, female, black, MI6 agent... who is a heroin addict... living undercover in a council flat in the Shetland Islands" - Not Cliche. (Actually, I'm going to steal that one for myself :)

If in doubt, consider your character's flaws.
As a last resort -> Turn them female, cute... and goth.

Hey, it worked for NCIS.

"But I would readily think pointing out a protagonist in the logline for a story with a complex plot would make it sound like a cliche."

Stumbling over cliche's is my current problem. I have rewritten my logline about 70-80 times now.

But the audience will connect with one character, who is that character and what is the worst thing that could happen if he does't stop the bad men doing the bad thing?