[quote=@The 42nd Gecko]
1. I didn't remind KoL guys that Miyu, occasionally known as Revolver Ocelot, who betrayed her love interest, and who tried to throw a cross-faction birthday party, has character traits that means she likes making friends even across factions, but will still continue to fight them even after making friends. This made KoL frustrated that I seemed to be acting out of character out of sheer desire to throw wonkey wrenches.
[/quote]

This can be easily solved with just a reminder. KoL probably forgot about Miyu intentionally being a traitor. No big problem there.

[quote=@The 42nd Gecko]
2. I didn't make Miyu strong enough, and that complaining about that is frustrating KoL.
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Yes, this is a problem. You don't have to make OP characters of course and we don't require you to. But if you intentionally make a weak character and then complain about them being weak, then yes that's a problem and it is frustrating because the GMs can't do anything about it; you're the one who chose to make them weak after all.

[quote=@The 42nd Gecko]
Not a one person looked at Miyu when she was being accepted (I went back and checked) and said "Hey, that looks kinda weak compared to captain instant teleport, super strong, super durable, super fast, gravity manipulation, black hole summoning, strong enough to wreck entire armies alone with a single aoe gravity attack, can go super saiyan, and is maybe holding the boundaries of the universe together. You shouldn't be quite that strong, but able to fight on the same battlefield as a meaningful contributor is expected."
[/quote]

I can't really speak for the other GMs, but I was under the assumption that you intentionally made them weak for a more Dark Souls feel. Kind of like Bonesword.

[quote=@The 42nd Gecko]
I'd also note, that when I had Miyu block one attack from Ni-Mu, KoL was incredulous for a moment that Miyu should be able to block it. I went with a "Well, yes, it says in my bio I was designed for this, and if I also make it so that it burns the shields out, is that ok?" And the KoL didn't raise any more fuss, so I thought it was just ok after those concessions. There wasn't a "Well, since you need to start boosting your power level, and your bio said you had that power, don't burn the shields out. Just establish that if Ni-Mu splits her focus and launches two attacks in one round, you can block half her attacks as easily as she can launch it." That would have been a very nice, and generous, reminder.
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This is more a case you need to resolve with KoL because as you've probably noticed, they like to let their emotions do the talking for them and as such, KoL's words do not represent the entirety of the GMs. That's why KoL is a Co-GM. Also consider that we're all humans here. I mean, I'm pretty sure KoL didn't think to even give you that kind of response due to the fact that emotions rule their writing. None of us are perfect here, especially the GMs. We forget alot.