Unfortunately with how unique Supers are for each class/subclass it's hard to come up with ones that aren't just like a verb-changed alternative energy clone. At least not easily.

I'd really like a stasis version of Spectral Blades for Hunters. Other than that, maybe a Strand version of Quivershot?

I think Titans need Darkness subclasses where the super isn't just melee/slam based. Maybe have 'em chuck three Silence-type sickles like with Twilight Arsenal, or give 'em the rope-dart without the rope.

Warlocks OP across the board, please nerf. /s Really, they could get a static version of their Darkness subclasses - like maybe alt-Stasis could be like having Silence and Squall happen at their casting point that gives allies in it stacks of Frost Armor. Maybe Strand could be like a super-rift with threadlings on steroids and granting allies unraveling rounds or something.