The Aqua profile has been considered to be an upgrade to the already existing Riki profile. Although the profile seems to be relatively new and only appears in a handful of sets, there are already thoughts that this profile is going to become standard within the future, potentially replacing Riki profiles entirely.
Aqua, shown aptly above with her smug look and accompanying bat, is the namesake of the profile. For an extremely cheap cost of choosing a character in your waiting room to send to the bottom of your clock and a stock when reversed, Aqua performed the double duty of potentially accelerating you to level one and refilling up to two hand from the top of your deck. Keep in mind that this also helped immensely in helping fulfill colour requirements for multi-colour decks.
There is rarely a scenario outside of damaging yourself to death where Aqua isn’t a great card to have. Aqua doesn’t require to be reversed, letting you play over her to force her to waiting room if need be. Her random gain from the top of your deck is mitigated by the fact that modern day filters as of this writing are so efficient at hand swapping where any hand could be considered as another resource to switch soon after. Aside from the worst case of revealing two climaxes or events and milling them subsequently, Aqua can usually at least net you one hand, making her equivalent to Riki without the selection ability.
ALL/S76-001SP-SP 凛々しく咲く 神琳 (center)
PRD/W100-058R 次なる美食を求めて キャル (right)
Aqua is not the first card to have this type of profile. Other have existed before, but none as memorable as this Hololive card. As the profile is rather new compared to some other profiles, not as many sets have access to “Aqua”. However, if given the opportunity, Aqua is a great card to add to any deck to help ensure you maintain hand advantage while colour fixing in the process.