Stats

That's his Boon. Sometimes they do that.

Also, that's a lot of YouTube notifications.

i see a lot of people having the same issue with tharja and her HP stat and i remember someone saying that means it has reached a soft cap and cannot be increased further, idk if this is true at all, try giving him the def +1 sacred seal and see what happens

edit: did some more forum surfing n found that it happens with HP boon and Spd Boon tharja and camilla respectively. If anyone has more info i'd love to hear it

Checked with units I have with boon/bane, then some neutral units, and I never saw green numbers. So, any possibilities of it representing a boon have been disproven.