How long between revisiting characters?
How long is a piece of string?
The time between Red Sonja and the next Red Sonja appears to be around 1 year.
It's safe to assume, Red Sonja is popular and sells well. With each new Red Sonja, she looks better than the last, probably to the annoyance of Red Sonja fans with limited budgets
Then there's other characters, Aspen for example. I cannot see there being another Aspen anytime soon. But what do i know?
Harley Quinn is super popular. So is Margot Robbie. With plans for Suicide Squad 2 and a Harley Quinn movie, Margot Robbie fans are in for a treat, providing they can master sculpting her face ;D