Initiative is an ability check.
From what I understand, a DM may ask his players to use Passive scores for ability checks and/or use them for his NPCs (ex: Passive Perception).
Is Passive Initiative something that can be used by a DM, by RAW ?
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Sign up to join this communityYes, there are passive initiative checks. See DMG, page 270, "Initiative Variants":
Initiative Score
With this optional rule, creature don't roll initiative at the start of combat. Instead, each creature has an initiative score, which is a passive Dexterity check: 10 + Dexterity modifier.