This package includes descriptions of all the items you may include in your learner profiles including: Enneagram Types, Myers Briggs. True Colours, MI and Learning Styles.
This website has been used to develop a number of open-source psychological tests. All are availible under a creative commons licence. This is the full list of such tests, not all have been finalized:
Open Extended Jungian Type Scales (documentation) * Myers Briggs
Open Hemispheric Brain Dominance Scale (documentation)
Open Enneagram of Personality Scales
Exposure Based Face Memory Test
For other open source measures, try the International Personality Item Pool.
These are some options you may want to consider for student learner profiles for older students - especially the Jung/Myers Briggs and Enneagram scales.