To clarify first, Joan and Siegfried are the only 2 Legandary I have available right now.

My water team is currently: Cthulhu, Nike (or Sol), Belphy, and Oceanus.

My Light team is currently: Athena, Shamash, Diana, and Sol.

I'm thinking of replacing Athena with Artemis if Joan is an acceptable Defender replacement for Athena on my Light team.