For manx records I dont recall seeing any as such (though eg the membership of libraries/clubs might still exist somewhere in archives of Manx Museum) - however if they were on half-pay then some UK army records would exist but I've never researched them.
There were plenty of such people about (eg United Services club in Douglas was established 1829 - I think I have already given elsewhere H S Browns caustic comment on them
. The conclusion of the great wars arrived at by the Battle of Waterloo had sent to the Isle of Man a large number of naval and military officers, who lived on their half-pay or their pensions; people poor and proud, and generally ill-informed, who spent their time in idleness, and did nothing to improve the tone of society. There was another and still worse element in the population—men given to drink—whose friends thought the Isle of Man the best place for them. There they could get drink very cheap, and would soon finish themselves.
see http://www.ee.surrey.ac.uk/Contrib/manx/fulltext/hsb1888/ch01.htm
- what name are you seeking?
Frances