I will start with Jesse Tuck. He thinks that living forever is a great bit of fun. It's one huge adventure to him, because it allows him an unlimited amount of time to go see things that he has always wanted to see and do things that he has always wanted to do.
"Just think of all the things we've seen in the world! All the things we're going to see! . . . We might as well enjoy it, long as we can't change it."
However, Jesse is the only Tuck that feels that way. Miles Tuck sees his immortality as a responsibility. He thinks that he has been given a tool, and it is his job to do something important with that tool.
"There's a whole lot more to it than Jesse Tuck's good times, you know. . . Someday," said Miles, "I'll find a way to do something important."
Mae Tuck's opinion seems to be calm acceptance. She doesn't feel the need to go do anything grand and important like Miles, but she also doesn't feel the need to go and make the world her playground like Jesse. I believe that Mae's attitude can be summed up with the following common phrase: "It is what it is."
Angus Tuck has his own unique attitude as well. Of all the Tucks, he is the only Tuck that wishes that he was not immortal. He wants the ability to die. To Angus, if a person can't die, then a person really isn't living. That person is just there . . . like a rock.
"You can't have living without dying. So you can't call it living, what we got. We just are, we just be, like rocks beside the road."
It's entirely up to you to decide who you agree with most. Whichever Tuck you choose though, be sure to explain why you agree with him/her the most.