Sergio Gadea is a former 125cc racer, who moved up to the Moto2 series in 2010.
Gadea started to race professionally in 2003 and his best 125cc finish came in 2009 where he finished the season in 5th place in the Championship.
Gadea has also more recently competed in World Superbikes and Supersport.
Gadea races with Suomy helmets and Suomy did release a Gadea replica a number of years ago, but there are none on the market at the moment.
You may get lucky on with some older Gadea replicas.