Was it intentional that the triggers don't include attacks on the champion itself?
I'd assume so.
The good Champion is all about protecting allies and retaliating against those who hurt them, with the potential benefit of drawing your enemies' focus to you instead.
A more classic "riposte when attacked" will probably more be something the neutral and/or evil champs do.
Unless the old "you're your own ally" rule applies here, but I haven't heard that much for 2e so far.
Unless the old "you're your own ally" rule applies here, but I haven't heard that much for 2e so far.
It explicitly does not apply.
Some effects target or require an ally, or otherwise refer to an ally. This must be someone on your side, often another PC, but it might be a bystander you are trying to protect. You are not your own ally. If it isn’t clear, the GM decides who counts as an ally or an enemy.