First, find out the training needs analysis. Is it based on communication, teamwork, identity issues, strategic thinking, influencing skills, responsibility, and awareness? Please trace the grey areas and develop a plan for the same.
Understanding Personality
Personality, in itself, is a very wide and vast term. You have to check the DISC profiling or any attribute test that will help you recognize their grey areas. Possibly have a discussion with the TLs/Managers to find out the culture or mindset of their respective teams and determine how these grey areas can be addressed.
Thanks and regards.