Naughty Dog VP and director of The Last of Us: Part 2, Neil Druckmann, confirms that Ellie will have an AI companion in the forthcoming PlayStation 4 exclusive.
TIL Ellie was supposed to have a dog as a companion for part II : r/thelastofus
The Last of Us Part 2' Training Manual Location & Skill Tree Upgrade Guide
The Last of Us Part II Remastered: Exploring the Roguelike Survival Mode, No Return
Why The Last of Us Part II Remastered's roguelike mode won't get any DLC
Ellie Williams, The Last of Us Wiki
The Last Of Us Part 2 // AI Guide - Stalkers
I asked an AI to write the Last of Us 3 : r/thelastofus
Everything I wish I knew before playing 'The Last Of Us Part II