Less general in characters:
In the hierarchy of biological classification, the level of specificity increases as we move from higher to lower categories. The genus is a higher taxonomic rank, and as we move towards more specific categories, the characters become less general.

Explanation:
Let's look at the given options and compare them to the genus:

Family:
- Family is a higher taxonomic rank than the genus.
- It includes one or more related genera that share common characteristics.
- Therefore, family is more general in characters compared to the genus.

Species:
- Species is a lower taxonomic rank than the genus.
- It is the most specific category in the biological classification.
- Species are groups of organisms that can interbreed and produce fertile offspring.
- The species level is where the most distinctive and specific characteristics are observed.
- Therefore, species is less general in characters compared to the genus.

Division:
- Division is a higher taxonomic rank than the genus.
- It is commonly used in the classification of plants, equivalent to the phylum in animals.
- Divisions are groups of related plant families.
- Therefore, division is more general in characters compared to the genus.

Class:
- Class is a higher taxonomic rank than the genus.
- It is a category that includes one or more related orders.
- Classes are groups of related organisms with common characteristics.
- Therefore, class is more general in characters compared to the genus.

Conclusion:
Among the given options, species is the least general in characters when compared to the genus. Species represents the most specific and distinctive category in the biological classification hierarchy, where organisms share the most unique characteristics.