How to play as an octoling?

I often play with players that play as an octoling, but I can't seem to find the option?

Do you need the Octo-expansion to play as an octoling or is the option hidden somewhere?

1 Answer

Yes, you need Octo expansion DLC as far as I remember, and the wiki seems to confirm that:

Octolings are only available after beating the Octo Expansion DLC.