The phrase "vivid characters" is perfectly correct and can be used in written English.
For example, you could use it in the sentence: "The author's vivid characters kept me engaged in the story until the last page."
The basket on this bike is full of vivid characters.
This malleability makes Brown one of rap's most vivid characters.
It's an entertaining and unusual tale, teeming with vivid characters.
Its melodic power is overwhelming and in his creation of credible and vivid characters.
Well-written, with vivid characters, "A Shadow Falls" is as enthralling as a novel.
But while famous multinationals are vivid characters in the story, they aren't determining the plot.
The stories he tells are full of vivid characters and wild detail.
Oddly, in a book of vivid characters, Sillett, the protagonist, is the least vivid.
Practically overnight, Westminster's most vivid characters – from the Notting Hill set to Nigel Farage – vanished.
I loved Sufiya's depiction of Pakistan – its culture and traditions – and the vivid characters.
Great adventure stories often rely on two elements: vivid characters and bad weather.
