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This is fun, but I have a single addendum: instead of controlling a small number of bugs but getting detailed sensory data, Lisa should have no control over any bugs but get the sense data from all of them within a range similar, if only a bit smaller, to Taylor’s
I'm chewing enthusiastically on the possibilities of an AU featuring Taylor, Lisa, and Brian as cluster triggers. Setting aside the incredible AU gymnastics required to make something resembling their canon triggers occur in close proximity and rapid succession to each other, the possibilities of their versions of each other's powers have me frothing at the lips.
I think their versions of each other's powers should still be shaped towards their own traumas, so:
Taylor's version of Brian's power focuses more on the power copying than the darkness. I think when she makes contact with a parahuman, she picks up an extremely weak version of their power for a short time. Like, touching Sundancer would let her make a match flame. But when her bugs touch a parahuman, they also gain a weak version of the power, and she can use a large swarm of very weak powers to very great effect. I think her version of Lisa's power would give her insight specifically on power mechanics and interactions; she can extrapolate power function from seeing it in use or its consequences.
Brian's version of Taylor's power would, I think, be a very direct, more limited form. I think he can, with concentration, manifest bugs out of darkness that he can control to the same degree that Taylor controls her swarm. What he does not get, however, is her multitasking ability, and if he's not maintaining active concentration on a group of his shadow bugs, they dissolve. So manifesting and using more than a small number for a simple task is pretty incapacitating for him. His version of Lisa's power is all about his own presentation; he can intuit how people perceive him and what he would need to do to change their perception of him into something different.
Lisa's version of Taylor's power would be all about information gathering - she can manifest a very small number of bugs under her control, and her control doesn't have much finesse, but she can process their sensory input extremely well. Her version of Brian's power would let her tag people with clinging shadows via projectile - as long as the shadow lingers, she can sense exactly where they are relative to her in great detail.
And that's not even touching on what their cluster power balancing would be! Something fun and psychological that really plays up the opportunity for cluster bleed through and kiss-kill dynamics.
It'd also be a ton of fun to explore how that bleed through affects them all psychologically, especially if they come together at a point in time where Lisa and Brian are as new to and insecure in their powers as Taylor. I think there's room for delightfully frightening shades of codependence only previously visible to shrimp.
And, of course, I think that would all almost inevitably lead to what would be simultaneously the most emotionally horny and emotionally repressed threesome known to man. None of them would be able to look each other in the eyes for weeks - except for Lisa, who Won the threesome, something that is not only possible but extremely Normal and Healthy, thank you very much.