It's been a while since I read Warrior Cats, but Lionheart would do a bit of both, he would fight, no matter the cost, but he would also look out for his leader. Is this before or after Omen of the Stars, though? Since that effects his overall strength.
Scientists had begun to debate privately whether or not Pluto is a plant, but this was the first time the concept was presented in a museum for all to see