You can't apply the "the more, the better" rule when it comes to persona creation. The number of personas depends on your research data and market segmentation. If your product or service is available internationally and you have many user groups, it still doesn’t mean you should have dozens of personas.

Some user groups with similar characteristics can be merged. Other groups representing small or specific segments are not worth designing for and can be eliminated. Plus, personas are pretty hard to maintain and update regularly, so you would end up wasting too much time and effort keeping them all updated. The more personas you have, the harder it is to create a more focused product.^[1]

When you have more than one persona, it makes sense to differentiate between primary and secondary personas:

• A primary persona represents the most relevant and the largest group of users who actually use your product.
• A secondary persona(s) refers to potential users or users who have special needs (like people with disabilities).^[2]