As of the next update, you'll gain an additional +3 Arena Score per kill with each week's bonus hero. The Askr trio (and Fjorm) are permanently rotating in the bonus hero pool each arena season.
Alfonse->Sharena->Anna->Fjorm->Repeat
It's currently Fjorm. In two weeks, it will be Alfonse. As we can't predict what heroes will be bonuses for a particular arena season and, for most players, it's unrealistic to pull on every new banner, the safest way to ensure you have a bonus unit is to promote and build the Askr trio and Fjorm (who you should be building anyway).
You'll essentially have 3 core units of your choice (who are basically now cheerleaders) all supporting the season's bonus unit who is to get every kill every match for any given season.
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