Sidekick has these relationships to other tropes:

parents kids shares a parent with:
Bastard Understudy
Bumbling Sidekick
Cowardly Sidekick
Fairy Companion
Hypercompetent Sidekick
Kid Sidekick
Non Human Sidekick
Non Player Companion
Psycho Sidekick
Reckless Sidekick
Talking Appliance Sidekick
The Watson
parent child
DeuteragonistThe Aragorn
''The Lancer
''Supporting Leader
You'll need to Get Known if you want to add or modify these relationships.