The main elements were the large roster of Mario characters playing in baseball fields with Mario elements. Mario Super Sluggers features the largest roster of any Mario game. The main games included a chemistry mechanic that improve character's abilities if they had good relationships. There is also a special swing and pitch mechanic which is increases the power of the pitch/ swing and made it difficult to receive. Captains had special versions of the swing and pitch which had addition effects.
There is a total of 2 proper entries in the series with a compilation of Mario sports games featuring Mario Baseball as a mode