Mualani is able to consistently Vaporize her Sharky Bites as colliding with enemies while on Sharky Surfboard does not apply any Hydro.
If Mualani attacks a marked enemy with a Sharky Bite, any other marked enemies are hit with additional Missiles. Both the Sharky Bites and the additional Missiles are considered Normal Attack Damage.
Regarding Weapon Choices:
Sacrificial Jade: When paired with or , CRIT Rate substats are no longer desirable.
The Widsith:On average, this weapon at [R5] performs similarly to [R5]. It's worth noting that due to buff downtime and the possibility of getting the ATK buff, this weapon is worse for consistent performance and can end up worse. However, if you are willing to reset for good buffs (DMG% or EM), it can outperform.
Regarding Artifact Choices:
Sets
Marechaussee Hunter (4): Only to be used when paired with Furina. Worse than (4).
Main Stats
HP%: HP circlet is primarily an option for CRIT DMG weapons as well.
Elemental Mastery: Strong Elemental Mastery buffs, or an EM weapon, can devalue EM Main Stats.