A character that offers you advice or who appears to be an authority figure or just someone with a smile that may not particularly fit into dream is most likely one of your guides.
For instance you dream of coming out of an undesirable house where there are shadowy people cooking raw stakes that remain raw even after cooked and are intended for you to eat, and you are a vegetarian. Suddenly and out of context to the rest of the dream you find yourself in the outside of the house and getting onto a bus with your best friend, the bus is not moving, but you feel relieved not to be around the cooks. You specifically notice and remember the bus driver, but he/she does not seem to be playing a part of your dream subject – which is you and your friend on a bus that is not moving.
The driver is your guide here. You were taken from an unpleasant dream that you got involved with in the psychic plain by your guide and put in a protected area, the bus.
The guide realizes that things experienced in the psychic realm can be designed to cause you problems in the awaken state and even cause unpleasant physical manifestations to occur. Most likely your guide will also take an opportunity such as this to give you a message.
A guide will always be kind and loving to you or sometimes just silent but always positive.
A guide can be just a voice you hear.
The voice will be a pleasant rather than an unpleasant or frightening one. This is not to say it can’t be a stern and authoritive voice if that is what you need to get the message being given. Government-Control, internal and external law making and enforcing.