I have enough mats for one purple 5*.
These are available: Quintus+costume, Khiona, Obakan, and Grimble.
My fully ascended 5* are
red: BK, Red hood
green: Telluria, Lianna
blue: Magni, Vela
JF is one ring away and Joon is two darts away.
I guess many would say Khiona but she is overlapping with BK in offensive buff.
Primary focus is to improve raid offense and aw. For now, I’m satisfied with yellow titan hits.