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?
Yes, you need Octo expansion DLC as far as I remember, and the https://splatoonwiki.org/wiki/Octoling_(playable) seems to confirm that:
Octolings are only available after beating the Octo Expansion DLC.