Here's an idea that follows 3 storylines which are suppose to eventually converge.

It is called 'Alpha&Omega', and is a sci-fi roleplay set in the far future.  The Alliance has occupied much of the galaxy and passes laws and regulations that allow them to maintain a strict hold over their domains.  Then there's the Federation, who despise the Alliance and wish to remain independent, but they banded together once before to stand against the Alliance.

There's a planet called Corvais, and it is rich in resources and is very important because its system acts as a gateway to either side of space; it is like Constantinople/Istanbul in space.  The Alliance and Federation fought over Corvais long ago in what is now known as the 'Corvais Wars'.

About 1/4th of the galaxy is known as 'Deadzone', which no one controls and is only partially explored.  This is where thugs, slavers, gangsters, mercenaries, and other vile beings make their home.

The three stories are:
1.  Omega Squad:  Group of rag-tag bounty hunters, thugs, assassins, and criminals who try to stop 'something' in Deadzone. Custom characters.
2.  Alpha Squad:  Highly skilled advanced team of veterans.  Colton is the squad leader, has a jetpack, likes to use pistols and assault rifles.  Lex Stratus is a scout, is intelligent, and likes to use a semi-automatic scout rifle.  Wolf is a mute and likes to use sniper rifles, but he's also an expert martial artist and collects knives.  Finally, Rigs is the heavy weapons specialist and demolitionist.
3.  A Council in the Alliance that tries to stave off a war between the Alliance and the Federation, debating and arguing with each other.  They can call in their assets: Alpha Squad, to handle specific situations.  They also hire Omega Squad to deal with matters within Deadzone.  Whatever they agree on is what Omega Squad and Alpha Squad end up doing.