It has a high chance of occurring with 'classic' characters, but not necessarily their sidekicks. If the character's use of the trope slowly starts to disappear, that character may have outgrown it.
Using the trope during the creation of any more recent character however, is noticeably avoided. Cracked on why Superman continues to get away with Clark Kenting, 'The 9 Stupidest Superhero Secret Identities'Ī character uses a trope which may be clichéd, discredited or even dead at this point, but is allowed because it's tied into the character's legacy.