1) Conceiver 2) Future groom, possibly 3) He pops the question 4) Maker of a motion 5) Mastermind 6) Model, by trade 7) One makes a formal motion 8) One on bended knee 9) Originator 10) Suggester 1) Mover 2) Nominator 3) Suggester 
• (n.) One who proposes or offers anything for consideration or adoption. • (n.) A speaker; an orator.
Pro·pos'er noun 1. One who proposes or offers anything for consideration or adoption. 2. A speaker; an orator. [ Obsolete] Shak. 
[n] - (parliamentary procedure) someone who makes a formal motion
noun (parliamentary procedure) someone who makes a formal motion