There are sidekicks that become heroes, in their own right, like Nightwing. Some sidekicks had a hard knock life like Arsenal. Some heroes have never had a sidekick.
If given the opportunity to sidekick for a hero, who would you choose. Given powers and abilities to be on par with your hero. You would fight side by side with them, hangout with them, and struggle or benefit with them.
Given the chance I’d like to sidekick with Starman. Crime rate is low and slow in Opal City, Starman has cool friends and would probably make as many mistakes as I would.