So Octavia now has Vriska's old powers of mind control. Fortunately (?), she's not very good at using them yet! This is where you get to dictate how good she is at using them on your characters, should she ever want to attempt it.
(It's also where you get to say "keep your mitts off my brain, spiderhag, don't even try it.")
Since canon itself has basically said "you know all those rules we had about Vriska's powers? Rules are for losers let's contradict every single one of them," the only restriction I'll put on potential victims is that robots and animals are 100% immune. Everyone else is as immune as they want to be (and anyone who doesn't comment here will be assumed to have immunity).
Finally, even if you're up for mind control generally I will always ask first before actually doing it in a thread, and the option to make it fail is always a thing. Even characters who are completely susceptible to being controlled can shake it off if they try hard enough: the control actually presents itself as a very strong mental suggestion.
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Thanks a lot!