I'll go through how he is in the film.
LBT 1: Well, he's clearly shown as being a lot more racist then Littlefoot's mom is, but then again, he it's established that threehorns are very stubborn. If he was in a situation similar to Cera, I don't think the idea of him (reluctantly) joining the others is out of question.
LBT 2: Absolutely nothing really bad from him here. He even steps in front of Ducky and Petrie when one of Chomper's parents attacks them. They're not his kids, or threehorns even, but he protects them anyways, which is a big step from what we'd seen so far of him. He's also even scene getting leaves down for different kinds of dinosaurs during the credits.
LBT 3: The first film where he really learns his lesson. A lot of what he does in this movie is because he is frustrated over the water problem. And the reason he doesn't want to make exceptions for kids because he doesn't want to be seen as soft or anything. As for leading Cera into the fire, it's not too different from what Cera herself did in the first movie. She was sure she knew the right way, but she was wrong. Here, the same thing happens with Topps. He would never lead his daughter into danger if he wasn't positive it was the right way, and unfortunately, sometimes when we're sure we're right, we just end up being wrong.
LBT 4: Nothing here to discuss. Just that there's a smaller threehorn beside him who looks just like him.\
LBT 5: Again, he's very frustrated cause of the heat, but towards the end, you can tell he's not as bad as you might think.
LBT 6: Scolding Cera for losing the twins is a perfectly normal thing for a parent to do. As for how he acted about Doc, he may just have a hard time letting old predjudices go, but he actually is now talking to Littlefoot and calling him by his name. He even kindly adressed him as "son", so I think by this point Topps has certainly come a long way.
LBT 7: He's really grouchy in this one. But he does owe up when it's his fault.
LBT 8: Once again, he's simply grouchy at Thicknose cause he's hungry---he even says so. Once he gets to the oasis, he and Thicknose are on good terms.
LBT 9: Really, the only thing you could possibly consider bad was his unwillingness to help Mo, whom, for all he knew, was something dangerous.
LBT 10: His appearence this time was a bit of a joke <_<
LBT 11: Now he gets a girlfriend and is being softened. As for wanting to exterminate the tiny longnecks...let's just say I think a lot of us had negative thoughts about them on first seeing them, so we shouldn't just blame him so quickly.
LBT 12: His new daughter is about to hatch, so it's obvious he's gonna be grumpy if someone makes an interuption! Really, he's
too soft by now.
LBT 13: Don't care
Really, it seems he's not as mean as we think he is!
Just wish they didn't have to bring Tricia and Tria in to soften him up. <_< Guess I'll just have to make do with his earlier appearences.