Good Partners for Mysterio
I've been thinking about Mysterio recently, since he's been coming up in a number of threads. I've been maintaining that he's actually good, just narrowly focused, and wanted to think of some good partners for him. His main strength, I feel, is as a yellow and purple battery, but there aren't all that many Characters who really need those colours. The Traps are also worth consideration, but the number of teams that Invisibility has synergy with is small enough that I'll mostly leave that out. Mostly going to be keeping this to the 4* tier, with one major exception.
Starting off with that exception, like almost all Characters, he works better with Okoye. He can feed her yellow to heal, she can buff the damage from his Traps. This is actually also one of the situations where the Invisibility has some synergy, since while he's Invisible, he can match blue or purple without pushing her to the back and losing TU AP.
Looking at the Purple/Yellow/Black 4*, the only one that jumps out at all is Widow. Kingpin and C&D are yellow batteries anyhow, and use their purple to generate yellow, so that seems kind of counterproductive. Frost is just a no. Widow can def use the AP, but she's also a support character, so this would need to have them both in support of someone else, and I'm not really sure who I'd want that to be.
Most of the other blue/purple/yellow Characters want to actually use their blue AP, and the remaining few don't really need much. Maybe some fit with Coulson, but that's about all I can see. Full colour overlap is often kind of awkward to work with as well. Dropping down to 3*, I could see a fit with Falcon, but it doesn't really feel worthwhile, and the decent thirds to round out either don't work well with the other, I think.
Green/Purple/Yellow has the first really good fit, I think. Actually, I think he'd work reasonably well with most of the 3*/5* characters here, but the one who really stands out to me is MEHulk. Wants yellow, really wants purple, has plenty of board shake to make setting off Traps more likely, and has a small, but non-negligible chance of generating blue with his yellow to keep the cycle going.
Red/Yellow/Purple has the other two I think could work well with him. Ironically, they're allies of his nemesis, but hey, we can make whatever combos we want in MPQ. Both Gwen and Miles will take all the yellow and purple they can get, and neither cares about blue. Depending on the third, Miles also opens the possibility of making your entire team Invisible for at least a couple of turns, which is gimmicky, but potentially amusing/useful.
So, yeah, pretty narrow use case, but I def want to give those three a try next time I'm slumming it in SCL7, or maybe even in SCL9 if they're boosted soon. Especially MEHulk, since I've always liked playing him anyhow.