Hi there,
Tickera works with any well-coded WordPress theme as it doesn’t have its own styling but rather follows the styling of a theme that you’re using and blends in its content as seamlessly as possible.
So, in short, Tickera itself does not have any special requirements in regards to themes and can work with any WordPress theme.
The only exception is if you will be using Tickera alongside WooCommerce via our Bridge for WooCommerce in which case ticket types are created as WooCommerce products and WooCommerce takes care of the whole checkout part. That said, if you will be using Tickera like this, you should make sure that the theme you intend on using declares WooCommerce compatibility (as WooCommerce requires specific templates that are not supported by all WordPress themes).
Hope this helps a bit.