Mind dropping the skill essay nuke?
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Jack is sent to kill a child. [4 MORE VOTES]
https://vsbattles.fandom.com/wiki/Raiden_(Metal_Gear)?so=search#Metal_Gear_Solid_2:_Sons_of_Liberty https://vsbattles.fandom.com/wiki/Ali_(Ejen_Ali)#Tekno_Magnetic_Suit speed equalized Ali after obtaining the Tekno Magnetic Suit and MGS4 Raiden is used 8-B keys are used Battle takes place...
That ultimately only results in Dio, Jotaro and Enya and maybe part 4 Kira.
Enya is JoJonium, it says her strength of will and stand power is comparable to that of stopping time (Aka Jotaro and Dio, who are above Kak in Stand Power and will). Dio and Jotaro speak for themselves, lots of stuff in the later half of Part 3 saying they have the strongest will and stand power (Jtar doing it in a lightnovel with Kak is just a bonus). Kira was just a maybe due to a force of will statement putting him above Jotaro, although only briefly, plus Part 8 Kira has it, but that's a hard maybe.
There's also Pol, but I can't think of anyone who's confirmed more Stand power than him except Jotaro and Dio. Not even Diavolo was flat-out stated to be above him in pure will or stand energy.
I would say Bruno, Gio and Mista, based on just the shit they've done, but, no statements actually exist saying they're > Kak/Pol in stand power.
I should note that being stronger in stats than these dudes doesn't mean you have more "Stand Power", it's more circumstantial and dependent on what the Stand itself is.