Speaking of those Global Guardians, a new version of Thunderlord could be neat. One that's less of a sonic blaster like Black Canary, and has more subtle uses for sonic powers, like being able to match the resonance frequency of something and *bolster* it (strengthening / healing the target), or emit a subsonic tone while fighting that disrupts the inner ear of other people so that they are off-balance and become nauseous, etc. (And yeah, still able to belt out the sonic attack, when necessary, although they find that a 'disharmonious' or 'inelegant' use of their powers, best saved for last resort.)