you can start by giving some basic dif about personality. then in the following slides put some photograps of some esteemed personalities like gandhi, hitler, some bus tychoons and then let audience say a word that will reflect there prosnilty. this way start the session by continuing about the personality theories like MBTI, type A, Type b theory etc. to make the session lighter give the audience some personality test which you know better and judege thier personailty. you can also take part of body language, grooming techniques and commucnication because these all help in framing the personality.
if condcuting a perosnalty test is difficult for you you may take help of some illusion images and let audience perceive them and you depict their personality. this way they will learn more and will enjoy the seesion too.
I am attaching the MBTI folder (got by the virtue of esteem members of cite hr) and a LINK which will help you to make your presentation better and distinguishing.
https://www.citehr.com/search_new.php?q=personality
hope these suggestions will pay help to you.
regards
pinkii