1st-level Spellcaster feature
The sidekick gains proficiency in one saving throw of your choice: Wisdom, Intelligence, or Charisma.
In addition, the sidekick gains proficiency in two skills of your choice from the following list: Arcana, History, Insight, Investigation, Medicine, Performance, Persuasion, and Religion.
The sidekick gains proficiency with light armor, and if it is a humanoid or has a simple or martial weapon in its stat block, it also gains proficiency with all simple weapons.