First, have you written up your character in great detail? What makes them tick, goals, background, etc.
A checklist can be found here https://www.stage32.com/lounge/screenwriting/Stop-writing-2D-characters.
You are putting your powerpoint together, so you want to have one character per page. Now, this is not a powerpoint that you would send directors or producers; this is simply for you.
This short-form does not include depth, in particular, "depth" taken from things happening within the movie that affect your character, etc. It is also not a character analysis.
Short-form, write each character into three paragraphs, on one page only.
Each paragraph focuses on something. This is an easy "go-to" for remembering particular focus points regarding your characters.
Let's say the first paragraph focuses on who they are, age, gender, place of birth, colour, job, and marital status.
The second part focuses on their skills, personality, achievements, background, etc.
Lastly, what are the character's goals, walls, and tragedies? How will he get there, what drives him, what is trying to stop him, that he must overcome, etc.