I've made several friends along my way.
Some of them I've changed.
I like to think I help them find their voice.
Sally, for instance, had an insulting serpent's tongue.
With my help, she became calming.
William resisted change. However, in some cases,
I was able to influence whomever was near us.
Timothy and I got along quite famously indeed.
When we befriended the popular kid, they wrote an article about it.
Caroline and I are also a power couple.
Trains and even some places of worship have echoed our work.
I tried to make friends with Kevin,
but I may as well have just left him alone.
Paul is consistently useful.
When we go places plus one, we can talk to anybody.
Gabby, it seems, has a mind of her own.
It's tough to predict what we'll end up doing together!
Surely there are cases in which I am unneeded.
I just hope I'm helping them all say what they mean.
Because all alone, I'm just a whisper.
Who am I?