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We identify and investigate known late M, L and T dwarfs in the Gaia seconddata release. This sample is being used as a training set in the Gaia dataprocessing chain of the ultra cool dwarfs work package. We find 695 objects inthe optical spectral range M8 to T6 with accurate Gaia coordinates, propermotions, and parallaxes which we combine with published spectral types andphotometry from large area optical and infrared sky surveys. We find that 100objects are in 47 multiple systems, of which 27 systems are published and 20are new. These will be useful benchmark systems and we discuss the requirementsto produce a complete catalog of multiple systems with an ultra cool dwarfcomponent. We examine the magnitudes in the Gaia passbands and find that theGBP magnitudes are unreliable and should not be used for these objects. Weexamine progressively redder colour magnitude diagrams and see a notableincrease in the main sequence scatter and a bivariate main sequence for old andyoung objects. We provide an absolute magnitude spectral sub-type calibrationfor G and GRP passbands along with linear fits over the range M8 L8 for otherpassbands.

The Gaia Ultra-Cool Dwarf Sample -- II: Structure at the end of the main sequence