- Cassie would be at least a C-Cup with styled hair.
- Rachel would either be a bimbo OR a brunette.
- Jake would be LaBouf
- Marco would be Korean
- Tobias wouldn't be with Rach, since Jake and Rach would NOT be related and thus, an item.
- The Yeerks would be computer chips used by a rogue Andalite Terrorist cell.
Not all bad ideas
Tyler Launter as Marco? I really can't imagine this
Second. And though I like Watson, definitely not my type of Rachel
I am a firm advocate of let's not bring Animorphs to the big screen.
It wouldn't happen for a dozen reasons beyond the TV show, in all fairness, but even if it did, what would it be?
There's thirty books of filler you can skip, but without redoing the storyline (and I don't want them to do that) you're watering down the most important stuff.
I'd be generous, imagine it as 3 films (Refuse to even hear about just one) speed through the introduction books, maybe make the David triology a second film and then blast through the final arch for a third film, but, I really don't see that as capturing the real heart of the series: Character development.
Animorphs is not a master of plot, but it's magnificent as a character driven story when the right plot elements are used (which is why even the filler isn't totally worthless) and I see no way to do real justice about how they progress by just lumping the biggest plots, which really is what you need for a film.
And that is why I believe if it should ever be on screen it should be small screen with 1-2 episodes a book so you can set the pace right and mix the necessary plots with the character's growth over a long and grueling fight.
But that's just my opinion-feel free to destroy it.
But never use known actors. Maybe certain big names to guest voice for like things Ellimist or Crayak, but not in the regular cast