Brave Police J-Decker is Transformers meets Patlabor...or a brief 90s Sunrise mecha anime called Armored Police Metal Jack with sentient robots instead of powered armor (some Metal Jack storylines were even reused for J-Decker, as they shared some of the writing staff).
Kara no Kyoukai meets K-On!. Mirai is like Ryougi Shikinote has deathly power, having a hard time expressing her true feelings, meets a genuinely Nice Guy who works under an aloof woman, except that she's a moeblob.
As the story progresses it becomes more like Mobile Suit Gundam meets Star Wars, with its multi-generational storyline, pilots with Jedi-like reflexes and perception and its characters occasionally flirting with the dark side.
The first few episodes of Gundam SEED are like Mobile Suit Gundam meets Gundam Wing (The Strike is the original RX-78 (White/Blue Hero Gundam), Aegis is Epyon (Red Transforming Gundam), Blitz is Deathscythe (Black Cloaking Gundam), Buster is Heavyarms (BFG Gundam), and Duel is Sandrock (Semi-normal but heavily-armored Gundam). AS for the rest of the mecha expies: