Thanks!
Yeah, I thought about Cthulhu for this ticket but considering I'm not very strong yet I thought I needed to be able to last longer than hit harder for now, and since I already have Osiris with a -20% atk C debuff, in the end I picked Ryu-Oh who would get me both, more dmg and def, and her atk debuff being a bit better than Cthulhu's.
On that note, yeah, I'm not going for the DPS race anytime soon xD, having a water main team the current event sucks for me, I have been just aiding on other people's raids with my wind team which is not very strong, only SR hime I have is Cybele, but at least has some debuffs as well (Cybele and Scathach) and Caspiel with a Def buff, which is why I was wondering how to know which debuffs were already applied so I could help the best I could. Heck, I find Leis to be way harder than Tartarus O.o... I doubt I'll be able to get MLB weapons or eidolons from this event T-T... so I'm sticking to disaster farming with my AP for now.