You don't have a party of companions traveling with you, but there are memorable characters that you have to visit during quests. You also get to accompany/escort certain characters during some quests.
At any rate, you won't feel alone. The game has a full cast of colorful characters, each with their own story.
Thank you! I went ahead and picked up the game (along with Tower of Time).
Another question about TW3: I know there are a LOT of mods out there for the game. I hate having to mod my games. Are any mods absolutely essential to playing TW3? As in, without them my game will be sort of broken?
I played it on the PS4 so no mods for me. I don't think that mods are essential for the first TW3 playthrough, the game has a whole lot to offer on its own.