If you liked the Batman: Gotham Knight anime, the Anime-Planet community thinks you'd like:
Forty years ago the citizens of Paradigm lost all of their memories, and live their lives without any knowledge of their past, or any hope for the future. Roger Smith is a man who performs the much needed task of negotiator in Paradigm. He provides his services to the wealthy with the help of a peculiar android named Dorothy and his mechanically inclined butler Norman. When greater evil arises, he calls on his magnificent relic of Paradigm's past, the Megadeus Big O. With Big O at his side, Roger Smith may be Paradigm's only hope of surviving in this new world without memories.
The Big O is heavily influenced by Batman - essentially, it's a series about Bruce Wayne if his secret identity were a giant robot. Batman: Gotham Knight is about Batman. Big O's visual style is inspired by the 1990s Batman cartoon, while Gotham Knight has some of the creative team - and the original voice - from that cartoon. Fans of the Dark Knight should give each a shot.
In Sternbuild City, corporate logos not only cover billboards, but also the costumes of the super-powered heroes that act as its protectors. Veteran and newcomer warriors of justice alike compete in a reality TV show that offers points for apprehending criminals while giving champions' sponsors a chance to promote their brand. When the low-ranking Wild Tiger loses his backing after a string of outrageous, botched rescues, he finds himself paired with an up-and-coming spotlight-seeker called Barnaby. But with their wildly different personalities, will the pair be able to save their beloved Sternbuild City and win the game show, or will their constant tension be the undoing of the world's first hero team?
OK, let's hear it at the beginning: Both series include masked heros of justice who are there to fight for the protection of their beloved city from crazed villans. There, I said it. Moving on. Both series include the main character whose parents have been killed by a murderer when they were very young and nowadays can no longer remember the murderer's face, so they decide to fight crime while at the same time investigating their parents' murder. Although Batman: Gotham Knight is and had to be far darker-themed and gloomier than Tiger & Bunny, the theme for both series is incredibly simmilar and the past and personalities of characters are also quite alike. On the other account, the animation of both seres has been tempered with and new things have been tried out; so if you're into that and pure masked avenger/hero action, I strongly reccommend it. :D
A year has passed since Jean Grey met her tragic demise, and the X-Men and Xavier Institute have yet to recover. Things change when Charles Xavier calls the disbanded mutant team back together, sending them to Japan to help find a missing girl named Hisako. But when they arrive abroad the team discovers that things are far worse than they expected: a shadowy group is abducting mutants, bringing them to secret laboratories, and an insidious, potentially fatal secondary mutation called the Damon-Hall Syndrome is spreading. Together, the X-Men must discover the truth behind these events and put a stop to the violence against mutants.
To put it simply, both of these are anime based on western comic books. They were both handled in a similar way; very dark and gritty animation and style. If you like it when eastern and western cultures collide, you might enjoy both of these series.