If you liked the Silent Mobius anime, the Anime-Planet community thinks you'd like:
Gawl, Koji and Ryo may seem like ordinary exchange students, but in reality they're anything but normal. The trio has travelled into the past to stop dangerous genetic research from being completed – research that has terrible consequences in the future – and Gawl, a boy with the ability to morph into a powerful creature, may be their best hope in succeeding. Now, between trying to hide their secret from the nosy daughter of their landlord and attending classes at Oju Academy, the boys must race against the clock to complete their mission at any cost.
It's been awhile since I've seen Silent Mobius, and it's true that Generator Gawl starts out more as a school life series, but both of these, imo, would be appreciated by the same audience. Each involves one or more folks who must battle crazy monsters, and just have a similar feel. It may be a gut feeling, but try out one if you liked the other - just bear in mind Silent Mobius is way better.
In the future, a devastating event known as Second Impact has destroyed Tokyo as we know it, giving rise to Tokyo III - a city under siege by mysterious lifeforms known only as Angels. Mankind's only line of defense are the Evangelions, a set man-made machines piloted by a trio of fourteen year-old teenagers, Rei, Shinji, and Asuka. The fate of Japan and the entire world now lie with these three children, though they might not have the power to save the most important thing of all: each other.
Kamui has returned to Tokyo with a traumatizing past, but he is not the only one. Many people are returning to Tokyo for the same reason: they play a part in the End of the World. The Dragons of Earth and the Dragons of Heaven now must fight for the destruction or safety of the world. But is this troubled Kamui really the key to saving the world?