There are several tools I used to create voice user and system personas. Some common tools include:

1. User research methods: These include techniques such as interviews, surveys, and user testing to gather data on user behavior, preferences, and needs.
2. Persona templates: These are pre-designed templates that can be used to create visual representations of voice user and system personas. Examples include Xtensio, Persona Maker, and Persona Creator.
3. Mind mapping and visualization tools: These can be used to organize and visualize user data, helping to identify patterns and insights that can inform persona creation. Examples include MindMeister, Miro, and Lucidchart.
4. Voice assistant platforms: These are tools that can be used to create voice user and system personas within the context of specific voice assistant platforms, such as Amazon Alexa or Google Assistant.

By using a combination of these tools and methods, designers can create effective and accurate voice user and system personas that inform the development of voice interfaces and AI-powered voice assistants.