Dragonborn

Although now rare, there are Dragonborn on Mystara. They have the normal PHB stats and abilities.
+2 Strength, +1 Charisma 
Also know as "half-dragons", but referring to themselves as the Gwanur, dragonborn mainly dwell within their own kingdom on the continent of Skothar.
However, there are some Gwanur settlements on Bellissaria, specifically withing the Kingdom of Surshield.  It is from here that any dragonborn encountered around Brun would hail from.  These wandering dragonborn tend towards professions with martial aspects though, like most from Surshield, are more open-minded and tolerant than peoples of other Alphatian-influenced nations (or even Surshield's capital, Spearpoint).