First of all, having debuff overlap is not a weakness. If you run Accessory Quests, you'll soon find a strength.

Cthulhu-Water Raphael-SSR Nike is generally the holy trinity of Water. With the next Miracle Ticket, you'll probably want to replace Aphrodite with Water Raphael. Aphrodite will still be extremely useful for content which either requires Cleanse or more Heals.

Until that time, running Mordred would be recommended. His debuff- and overlap with Ryu-Oh's Black Propaganda is amazing, especially since Ryu-Oh can miss hers even with +6% Affliction and Mordred's debuff- up, against neutral elements.