The games don't really have a consistent sense of what it is to be 100% light. We have a single character who is 100% dark, and Vanitas is very specifically defined by being extremely impulsive, extremely emotional, and extremely powerful. Whether this is because of his darkness or not is unclear, but given other characters like Terra are pretty impulsive and emotional, and that appears to tie to their darkness too, it seems likely.
As for the 100% light characters, the natural born ones (the first princesses), the naturally developed over time but notably NOT born wholly light ones (second princesses), and our one artificially created one all have intensely variable characterizations. One would expect placid acceptance or alienation to be the trait of extreme light, but we mostly only see that in nobodies (and other similar entities), and in the case of Aqua in particular, that acceptance and alienation from emotion marks her fall into darkness.
Based on (oh man, sorry about this) lore from the mobile game prequel, it's more likely that light and dark refer to two different kinds of goal.
Light is hope for the return to an earlier, perhaps more innocent, era of unity and peace. Darkness is the rejection of that old way, and the imposition of something new. What the new thing is might vary significantly from person to person.
This intense desire for new experiences is reflected well by Terra, Riku, and Vanitas. Less so by Xehanort, but his motivations at the end of KH3 are (awkwardly) shown to be seeking a return to the light anyway.
The pure lights that we see are also usually seeking a return to some kind of normalcy, whether it is Kairi's desire to be with Sora and Riku again, Ventus's desire to be with Terra and Aqua again, or the many princesses's desires to see their home worlds set back to rights.
This gets dubious with Belle and Ariel, however, as both have intense desires to fundamentally change their worlds. While one can argue that the changes being made would be returning those worlds to earlier status quo (eg, Ariel's desire to integrate herself with the surface would closely resemble the pre-fracture world where Atlantic was not barriered away from other realms), I feel that's a bit of a stretch.
One might be able to summarize light as "yearning" and dark as "taking," I suppose...
Honestly, being purely light is never adequately explored, and it's really tragic.
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As for the 100% light characters, the natural born ones (the first princesses), the naturally developed over time but notably NOT born wholly light ones (second princesses), and our one artificially created one all have intensely variable characterizations. One would expect placid acceptance or alienation to be the trait of extreme light, but we mostly only see that in nobodies (and other similar entities), and in the case of Aqua in particular, that acceptance and alienation from emotion marks her fall into darkness.
Based on (oh man, sorry about this) lore from the mobile game prequel, it's more likely that light and dark refer to two different kinds of goal.
Light is hope for the return to an earlier, perhaps more innocent, era of unity and peace. Darkness is the rejection of that old way, and the imposition of something new. What the new thing is might vary significantly from person to person.
This intense desire for new experiences is reflected well by Terra, Riku, and Vanitas. Less so by Xehanort, but his motivations at the end of KH3 are (awkwardly) shown to be seeking a return to the light anyway.
The pure lights that we see are also usually seeking a return to some kind of normalcy, whether it is Kairi's desire to be with Sora and Riku again, Ventus's desire to be with Terra and Aqua again, or the many princesses's desires to see their home worlds set back to rights.
This gets dubious with Belle and Ariel, however, as both have intense desires to fundamentally change their worlds. While one can argue that the changes being made would be returning those worlds to earlier status quo (eg, Ariel's desire to integrate herself with the surface would closely resemble the pre-fracture world where Atlantic was not barriered away from other realms), I feel that's a bit of a stretch.
One might be able to summarize light as "yearning" and dark as "taking," I suppose...
Honestly, being purely light is never adequately explored, and it's really tragic.