Self-Duplication power, ala Triplicate Girl or Flashback. (I searched on 'duplicate', 'duplication, and 'clone')
"Usable against others" -- wh
at if I want to teleport someone else against their will, or make someone else phantasmal?
More super-senses: Radio hearing, for one. Or super-touch which lets you read a book by feeling the temperature difference between the ink and similar stunts.
'Lycanthrope' heroes: Some method by which you can create a character with multiple bodies and minds, in effect, two PCs or NPCs who 'swap'. (HulK/Banner, Billy Batson/Captain Marvel, Don Blake/Thor)
'Serial' heroes (don't feel bad, NO game out there easily handles these well): Sleeper from Wild Cards or 'Dial 'H' For Hero' types.
'Omnigadgets':"Fortunately, I happened to have my bat-shark repellent on me!" The ability of heroes to 'happen to have' the precise gimmick they need. (How about a feat which grants a small pool of 'undefined' hero points, which a Gadgeteer can 'define' in-play, but, once defined, they remain 'locked' until the gadgeteer has returned to his home base?)
'Dynamic' power levels: "I can defeat Dr. Megadeath with my ultra-burst -- but I'll need to drop my force field to do it!" Character who have a 'power source' which powers one or more powers, but whose total levels are in flux, i.e, someone who has flight, heightened defenses (defined as a force field granting a deflection bonus) and an energy attack, with ten total 'levels' divided among them, changeable each round.
Sorry to sound like a shill, but Silver Age Sentinels handles all of these things easily...
There is a power called Duplicate which allows you to create copies of yourself. For an additional cost, those duplicates can even be customized with different abilities than the base form.
Usable against others can be added to practically any power by buying Power Modifiers... these allow a power like Teleport, Grow, Shrink, Density Control, etc to be used against other targets, and the levels of PMVs you buy determine the range, area of effect, duration, etc...
Lychanthropic heroes would use the Alternate Form power, giving you slightly more character points in return for having another, weaker or normal form that you change back to. Examples provided for Animal form, Elemental/Chemical forms, Flames, Gaseous, Incorporeal, Melded, Superhuman, and 2-dimensional, plus you can easily make more...
Serial Heroes in SAS can be made with the Power Flux ability... it gives you a pool of character points to buy other powers with, and you can only change those powers after a certain length of time or under certain circumstances (like 1/hour, must dial HERO on watch...)
Omni Gadgets can be made in SAS, or simulated with low levels of either Powerflux or Dynamic power. (Your reference to bat-shark repellant and Dynamic powers leads me to believe you already know SAS, as these things were discussed on their forums, but for those that don't know, I'm stating it here anyway)
SAS has the ability Dynamic Powers which allows a great range of control over a limited field, such as weather, magnetism, gravity, etc...
In fact, people have been trying to find things SAS can't do, and have been having a very hard time of it...
