Speech Bubble Tree Diagram.
A speech bubble diagram is most likely to be seen during a powerpoint presentation. This is simply because it is used to put life to the way people see your presentation. This color-coded template will help your audience determine and understand your points easily.
Colors should match your content
Try using colors which match the type of information in each bubble. Also, put some value to the contrast between your text color and your background. When presenting a positive thought, it would be helpful to use lively colors and the other way around.
In addition, you can also add more bubbles or images of people around your slide to make it appear these are opinions coming from valuable personages.