Unit Analysis by Team BethelFrankel
Class
Solid Detonator with global teleport and nuke.
Refines: Nice ATK boost and some flexibility in active use.
Overall
S
Advantages
+Relatively good off-turn damage due to marks persisting
+Better than normal mob-clearing for a pure Detonator, mainly due to good AoE/teleport on active and chain combo type
+Teleport on a DPS slot
+Has the highest ATK stat among Water units
Disadvantages
-Underwhelming Refinements; not particularly worth investment outside of waifu status
-Chain Combo setup isn't great for boss killing
-Requires some setup to get full damage, although this is somewhat alleviated by putting her in the Captain slot, due to her stacking on normal attacks
-A significant portion of her utility and damage ceiling is locked behind MBT
Explanation
Unfortunately, Sharona has fallen off quite a bit since the game's release.
Water was initally the lowest damage element, but the introduction of Bethel and Azure have done a lot to remedy that. As a result, Sharona's combo of respectable damage and a teleport are much less useful than they used to be.
However, that doesn't mean that you should write her off. She's still a top pick, and her damage fall-off in the late-game has never stopped anyone from rolling over most of high spire with her and Regal.
It is worth noting that MBT does allow Sharona to close the gap in damage between her and Bethel. But at the stages where we're considering MBTs, you're just better off with the plethora of broken units.