Anthropomorphise your product by all means.
Turn your sandwiches into whatever you like.
A cute cartoon character can help your sales.
But Sargeant Sarnie?
Come on.
Are you trying to ostracize some of your customers
On purpose
The military overtones
Especially with the state the world is in today
Would definitely exclude some of the public.
And ultimately affect your profits.
Greenham Common woman and Jihadists
Being two groups that spring to mind.