Just a question... would this be too far fetched?
[img=http://th05.deviantart.net/fs70/PRE/f/2013/177/0/8/zoids_x_evangelion_unit_00_dash_by_chobi_pho-d6aputr.jpg]

The soul imbued would be a pet or something... I do understand if it's not acceptable, I just thought it was interesting given the SXT unit idea I had.