I've asked about this before myself and Sana advised going Wind but that really leaves me no immediate draws until Cybele Unleashed comes out. I'm still leaning towards Cthulhu for this ticket to buff up my secondary team as I slowly shift from a rainbow style of play to Wind/Water with some Light on the side just because I like them really. That said I can easily switch to any colour if I happen to get the right SSR's to go with it. I currently have the following teams SSR's listed first with the SR's currently used after. I have all the original Souls releashed but usually use Dart, Andro, or Mordred for events.

Fire - Acala, Amateratsu, Agni, Brynhildr
Water - Poseiden, Ryo-Oh, Shiva, Nike
Wind - Titania, Odin, Gaia (Awakened), Oberon
Lightning - Brahma, Tyr, Raiko, Nemesis
Dark - Satan, Beelzebub, Amon Unleashed, Lu Bu
Light - Micheal, Raphael, Sol, Diana

Any reason to not just get Cthulhu for this ticket? Better options I'm missing? I'm thinking either Nike Unleashed or Aphrodite will be needed in my water team eventually but generally Andro does the job if healing is needed right now.