Right and Wrong Examiners
Some academics are definitely wrong as examiners for your viva: they don’t know your subject, your discipline or don’t have the requisite experience. They would never be asked.
Some academics are definitely capable to be your examiners: they are subject experts, experienced and have a good combination of knowledge and ability that means they could do the job.
Some academics might feel wrong to you as examiners: you’ve heard rumours or you’ve got a sense from interacting with them that you’d prefer not to engage with them in your viva.
Some academics might feel more right to you as examiner choices: they have a specific research interest you think connects with your work.
And some academics might be selected as your examiners regardless of whether you approve or not: ultimately, your supervisors decide.
What you can do, in advance of your viva, is think, consider and suggest names. You can express preferences and your supervisors can listen and decide what they need to decide.
Whoever your examiners are, they will be experienced, supported and capable. You will know who they are and know what they do. You can help yourself to be ready for meeting them.