Fight!! Iczer-One - Recommendations

Alt title: Tatakae!! Iczer-1

If you're looking for manga similar to Fight!! Iczer-One, you might like these titles.

Uwa Youjo Tsuyoi

Uwa Youjo Tsuyoi

I agree

Jamevu

Jamevu

Another Earth has been discovered by an astrologer in the US, giving it the name "Jamais Vu". That Earth is soon discovered to be a group of aliens, going around the galaxy before arriving in the actual Earth to kill people and appear like them.

I agree

Gantz/Exa (Light Novel)

Gantz/Exa (Light Novel)

I agree

Tokyo Interstellar Immigration

Tokyo Interstellar Immigration

There's aliens about, lurking just outta plain sight. Most of them are regular folks, but some? Some are criminal. Enter Interstellar Immigration, Tokyo's finest cosmic border patrol team. They bust their asses on the daily to keep planet earth safe. Thus the spotlight falls upon the story of two high school girls, Lein and Ann, as they kick ass, hunt down illegal aliens, and look great doing it! Buckle up for bombastic sci-fi action with a twist!

I agree

7 Billion Needles

7 Billion Needles

Hikaru Takabe is an anti-social young girl who wants nothing more than to be left alone. One night, while on a school trip, she goes to the beach when suddenly a meteor falls from the sky killing her instantly. The next thing she knows, Hikaru is sitting in class and believes the event from the beach to be nothing more than a daydream. However, when a mysterious voice begins talking directly into her head it informs her that she really did die that night and in order to revive her, the alien presence, known as Horizon, must always reside inside her. However, Horizon also has another purpose for coming to this world; after chasing a malevolent being known as Maelstrom across the universe, his target - which has the power to destroy all creation - sought sanctuary on Earth. Now Hikaru must help Horizon to find Maelstrom hidden amongst the 7 billion people on earth and kill him before it’s too late.

I agree

Birdy the Mighty (2003)

Birdy the Mighty (2003)

Birdy Cephon used to be a butt-kicking intergalactic Federation investigator who took down bad guys where they stand; Tsutomu Senkawa used to be a normal student with shy tendencies and a penchant for exploring abandoned houses. However, when Birdy accidentally killed Tsutomu while trying to apprehend a famous criminal on Earth, Geega, both of their lives changed forever! Now, while Tsutomu's body is reconstructed in a faraway place, the two must share the same body – Tsutomu controlling it by day, and Birdy taking over when she spots a criminal in need of tough justice. All Tsutomu wants is to live a normal life; can he manage to cope with Birdy's enormous eating habits, intense muscle use, and easily irritable attitude?

I agree

Queen's Seed

Queen's Seed

Yuto follows Mikoto, a childhood friend and high school girl who is one year older, to enter the same high school. When she goes home with Mikoto for the first time in a year, it turns out that Mikoto only sees Yuto as her younger brother. Yuto is a little dizzy about the difficult road ahead, but an alien "onee-san" in a very erotic outfit appears in front of the two...!? 

I agree

Hoshi no Ponko to Toufuya Reiko

Hoshi no Ponko to Toufuya Reiko

Reiko finds a starving mysterious animal that looks like a cat with wings. To the girl's surprise this cute animal names itself a space salesman that would sell advanced technology to humans for just a bit of hahise, which is abundant on Earth. But what is hahise? Would you pay it for a machine that can copy anything?

I agree

Kiss x Death

Kiss x Death

From the perspective of an alien planet with super-advanced technology and tiny (1/60th the size of a human) inhabitants, planet Earth was the perfect location to banish their worst criminals. Five of said criminals were sent to the planet to be exiled, attached to little critters like frogs and rabbits so they can never be fully active. Due to an accident, these five criminals managed to escape and attach themselves to five different girls that were nearby. The one responsible for the banishment of these five criminals now must detach them from the girls by mouth-to-mouth release.

I agree

You Mustn't Come to Kuganegasawa

You Mustn't Come to Kuganegasawa

They say in Kuganesawa that "beings with feathers had descended as if they came from heaven"... Professor Matoba chases after the meaning of those words left behind by his student, only to be confronted with horrors unthinkable by the human brain! 

I agree