I don't think Harbinger's power affects parahumans in particular. I think he's just a very skilled fighter with math powers.
Glaistig Uaine is almost a textbook example of Mimic Abilities, except...
-she projects her abilities as ghosts, which may or may not be mechanically relevant
-her copying ability is limited by number of capes, not by total Refresh cost
-she can switch out her copied abilities without losing them.
So maybe give her Variable Abilities, with a really long list that consists entirely of Mimic Abilities over and over again. And slap a Limitation on each Mimic Abilities that she can only Mimic one cape at a time, and can't mimic things that don't come from passengers. Then give her a pool of points sufficient to use three iterations of Mimic Abilities at once.
But that's a bit convoluted and I have no idea how much that Variable Abilities list should cost. So maybe it'd be better to do some more homebrewing.
She'd also need a Supernatural Sense for passenger-vision and maybe a Power for killing people by ripping out their passengers.
Small nitpicks, Contessa's Guide My Hand needs to have an upgrade as the book version doesn't allow it to be used for attacks or maneuevers.
That so?
I thought it just couldn't be used for physical attacks. That's (part of) why her Fists is so high.
I'm away from my books right now, but I'll go over her again when I get home.
A version of Projection with Modular Abilities seems about right (at one time, it was probably Variable Abilities, but she has so many spirits collected she probably has one for any occasion. If she doesn't, she prolly should get a compel with a Fate point).
Variable Abilities isn't a narrower version of Modular Abilities, you know.
Grant Powers [-2]: Touching a person allows you to grant them some or all of your powers for the scene. If they are unwilling, you must succeed a Fists vs. their Athletics to affect them. Only one person can benefit from a particular one of your powers at a time (see below).
[+2]: Power Genie: Only someone else can benefit from some of your powers, not yourself. When you select this, you must declare which powers it effects.
[-1]: Share Powers: An additional person can benefit from the same power. This may be taken multiple times, using the progression table*.
[-1]: Extended Duration: At the cost of a Fate Point, Grant Powers lasts for an entire session. At anytime you can use an action to ‘rescind’ the powers you’ve granted.
*I don't think table quite exists, but it would look like the Time Progression people. A minute = a person, a couple minutes = 5 people, 15 minutes = 15 people, etc...)
I don't want to be discouraging, but I think this needs work. The cost should scale with the number of Powers affected.
If two people each have 7 Refresh of Powers and this, they can touch each other at the start of each scene and then they'll each have 14 Refresh of Powers.
I suspect there are some Powers which benefit more from share-ability than others, too.
And I suspect the upgrades are abusable.
I hope this will help with characters like Othala and the mob boss who grants the electrical touch/invulnerability power sets, but also perhaps Null and Clockblocker (I'm working on statting him out, allowing him to grant Total Immunity to others with the limitations of requiring an action to activate and freezing whoever 'benefits' from it for a random amount of time).
Othala's set might look like: Supernatural Toughness, Supernatural Recovery, and Supernatural Speed along with Grant Powers (Power Genie [+2], Limitation [+1]: Others may only benefit from one of her powers at a time).
The mob boss might have Incite Effect, Supernatural/Mythic Toughness with Grant Powers (Power Genie [+2], Share Powers [-2], and Extended Duration [-1]).
Null might have Mimic Abilities or Variable Abilities (Limit: Split Strength - All rolls dealing with mimicked powers are at -2) with Grant Powers (Power Genie [+2], Share Powers [-5] and Extended Duration [-1].
Not sure if that's the best approach for Clockblocker. He doesn't really give people the benefits of invincibility...it's more like he temporarily takes them out.
Split Strength is an iffy weakness, incidentally, since many powers don't involve rolls. Toughness and Recovery come to mind.
I might use Variable Abilities for Othala, instead of Limitation.
The plan for...Galvanic, I think it was...looks pretty good to me. At least going by what I remember.