Here's a suggestion for my character. Feel free to change any details to fit with your world, Garner.

Wilhelm Silverhake
Human
Engineer

Background: Coming from a noble family, Wilhelm was disgracefully thrown out of the Royal Academy of Malmhem, a northern city-state, when he was 24 years old. His fascination with things that go boom had introduced him to the shady dealers of the Old Town, who had provided him with bang-powder. After a routine search of the dormitories Wilhelm's bang-powder was found and he was dispelled for possession of illegal substances. Wilhelm was forced to leave his home lands both by his father's rage and by his growing depts to the city's organised crime. He has since then travelled the world as an adventurer, and have to this day not returned to Malmhem or spoken with his family.

Appearance: The clothes Wilhelm wears were once lavish and impressive, but are now black from soot, stained with burn marks and patched with sewn-on pockets and belts containing various engineering tools and reagents. His head is bald and his face is hairless, save his singed eyelashes. The marks and wrinkles on his face suggests that he is around 50 years old.

Skills: Wilhelm is a skilled engineer with the ability to fix most things broken, and with a genuine interest in mechanics. Wilhelm knows basic blacksmithing but prefers to drill cogs and sprockets rather than smith horse shoes or cast iron knives. He also knows some chemistry, but this knowledge is limited to how to make things as flammable and explosive as possible.

Behaviour: Having led half of his life on the road, Wilhelm has lost almost all traces of his noble ancestry, and certainly his sense of etiquette. At first appearance, Wilhelm seems to care more about skillful inventions than the people around him, but those who spend more time with him will find he has a big heart.

Weapons (if needed): Wilhelm travels with a heavily modified six barreled flintlock musket. He rides a gray fat mule "What? Yeah! Searched for years til I found the deaf lil devil! Bangs don't scare him y'see!" that has a nasty kick but "Bastard's only ever helped me out once, and daemons knows I could've used that devillish kick more often! See this golden tooth here? That's him alright. Bloody tooth hurt for weeks til he kicked me in the mouth!"