I would be a
very poor team member.
I would plot and scheme on ways to win at all times, I would grill Ax for information that could help my strategies, challenge Cassie whenever her reluctance to morph animals that may or may not be sentient showed itself, I would devote my entire being to fighting and winning the war, to not only saving earth but to making sure it was never invaded again, I would have vhemently, perhaps violently opposed trapping Aftran as a whale based on her knowledge of the Yeerks if nothing else, I would have used the morphing cube right away after the David incident, I would have made reckless ruthless bad decisions because I'd care about just one thing: the survival of the human race, I wouldn't care about the price I had to personally pay in exchange for it.
At the end, assuming I hadn't been sent to take Rachel's place, or taken out earlier by the Yeerks or indeed by the Animorphs themselves, I would never have handed the pool ship over, I'd have told the Andalites to get out of my solar system or else bring it on, because earth was officially a no fly zone largely because I wouldn't trust them by that point but mostly because it wasn't andalite blood spilt obtaining it, it was the blood of the Human, Hork-Bajir and Taxxons (and one Andalite I guess), the races that those Andalite meddlers had been killing over and over again just to get at the Yeerks in their heads.
So yeah, I'd be a really ignorant insanely crappy Animorph