This six box template contains two characters of varying heights with speech bubbles for each. I've used this template over and over for project-based learning.
You can assess or practice any skill by asking your students to create a comic strip. I've used it to teach dialogue, word choice, theme, character's motives, and much more.
Please let me know if you have any questions or special requests. I can modify the number of characters or boxes. I'd also be happy to create a rubric that aligns this activity with a specific skill.