[quote=MrDidact]
Or just use costs or restrictions.
[/quote]
Delphine can't extend her hair to insane lengths (I'm thinking of making it shorter) and there's very little defense; she could like, wrap herself in it to deflect very minor physical attacks, but it will eventually become damaged, especially by firearms or sharp blades (which do hurt her hair if used repeatedly, which wasn't really mentioned in her powers bio). 
Syrah has no real actual ability to do any harm besides cutting off some nerves but she isn't able to do it to anything like a full arm. Maybe a trigger finger? LMAO. So she's heavily restricted to how well she can actually fight unless someone else is there, especially against people who can basically just tank through anything she throws at them. She works well with people like Justicar (who, at the moment, can control the velocity of himself and other organics/objects) and other people who require close-contact range. Her ability to make people seize to some degree could be considered an offensive power, but not all seizures are extremely potent or long.