1) Breakaway 2) Fissiparous 3) Independent 4) One who advocates secession 1) Breakaway 2) Independent 3) Loner 4) Separationist 
• (n.) One who withdraws or separates himself; especially, one who withdraws from a church to which he has belonged; a seceder from an established church; a dissenter; a nonconformist; a schismatic; a sectary.
any of the English Christians in the 16th and 17th centuries who wished to separate from the Church of England and form independent local churches. ... [16 related articles]
Sep`a·ra·tist noun [ Confer French séparatiste .] One who withdraws or separates himself; especially, one who withdraws from a church to which he has belonged; a seceder from an established church; a dissenter; a nonconformist; a schismatic; a sectary. « Heavy fines on divines who should p...
[n] - an advocate of secession or separation from a larger group (such as an established church or a national union)
separationist noun an advocate of secession or separation from a larger group (such as an established church or a national union)