The phrase "an assortment of characters" is correct and usable in written English.
You can use it when referring to a diverse or varied group of individuals or figures, often in the context of literature, film, or storytelling.
Example: "The novel features an assortment of characters, each with their own unique backgrounds and motivations."
Alternatives: "a variety of characters" or "a mix of characters."
There is an assortment of characters, some marine, others earthly.
Progressive is joining the ranks of insurers that run multiple campaigns with an assortment of characters, endorsers and spokesbeasts.
He slips in and out of an assortment of characters, some of them maniacally reasonable, others properly lunatic.
Russell Wangersky's Whirl Away investigated the consequences to an assortment of characters when they are pried out of their comfortable self-delusions and forced to face their weaknesses.
An all-day (and book-length) chauffeured trip across midtown Manhattan exposes DeLillo's cool, New Economy protagonist to an assortment of characters in this critique of hypercapitalism.
It begins in the vein of a classic Agatha Christie scenario like "Murder on the Orient Express," with an assortment of characters from different social classes steered into microcosmic confinement, some of them carrying troubling baggage.
It takes a brave writer to set her first novel on a Greek island, to populate it with an assortment of eccentric characters and follow the turbulent love lives of the women.
The Island by Victoria Hislop Review £14.99, pp320 It takes a brave writer to set her first novel on a Greek island, to populate it with an assortment of eccentric characters and follow the turbulent love lives of the women.
A verbose strip whose Sundays were often overrun with prose, its lead characters were Uriah and Ida Stumble, who rented rooms to an assortment of strange characters.
They'll run into an assortment of interesting characters and battle myriad monsters.
There are werewolves, shape-shifters and an assortment of undead characters, one of whom may or may not be Elvis.
