Comic book style speech bubbles are extremely easy to create in Adobe After Effects, and it's all done with shape layers.
Let's have a closer look.
Create the Shapes
To create these speech bubbles, I’ll be using the shape tool. First, I’ll grab the ellipse tool and create a simple shape, and then center it in the composition. Make sure your shape is set to have the anchor point in the middle. You can change the default setting in Preferences > General > Center Anchor Point in New Shape Layers. Or simply right-click and select Transform > Center Anchor Point in Layer Content.