You can start by giving some basic information about personality. Then, in the following slides, put some photographs of esteemed personalities like Gandhi, Hitler, some business tycoons, and then let the audience say a word that reflects their personality. This way, start the session by continuing with personality theories like MBTI, Type A, Type B theory, etc. To make the session lighter, give the audience some personality tests that you know better and judge their personality. You can also include body language, grooming techniques, and communication as they all help in shaping personality.
If conducting a personality test is difficult for you, you may seek help from some illusion images and let the audience perceive them while you depict their personality. This way, they will learn more and enjoy the session too.
I am attaching the MBTI folder (obtained through esteemed members of Cite HR) and a link that will help you make your presentation better and more distinct.
https://www.citehr.com/search_new.php?q=personality
I hope these suggestions will be helpful to you.
Regards,
Pinkii