Terra

Terra has the ability to sense strong qualities of light within the heart of a person. These are traits associated with goodness and/or heroism -- purity, honesty, selflessness, bravery, kindness, empathy etc. -- but it is only very exceptional individuals Terra is able to pick up on. In canon, these include the Princesses of Heart (Cinderella, Snow White, Aurora), as well as his friend Ventus, who all have hearts of pure light. Other exceptional individuals with a capacity for goodness, but who also carry darkness in their hearts, like Riku, are able to be sensed by Terra.

If you think your character has a powerful or pure enough light to be sensed by Terra, go ahead and let me know here (preferably with some canon examples to back it up). Likewise, if you want to opt out, drop me a comment.

As a side note, Terra can't sense powerful amounts of darkness within hearts. Go ahead and use that to your advantage, villain types.