Trainer is able to deliver the course clearly. Sharing of experience (personal experience). Make the sessions interesting and not dull.
Passionate, lots of experiences, willing to discuss difficult situations and share the practical side of handling situations.
To be positive and have positive mindset whenever we meet these kinds of people. To stay professional when it comes to handling work relationships. To be effective in the workplace such that higher-ups will still place their trust in you when any negativity is discussed about you.