An NGE/Getter Robo fusion.
From what I've seen (Shin Getter Robo: Armaggeddon, and some of New Getter Robo), piloting a getter machine more or less requires a certain measure of spit and vinegar and/or being a dangerous lunatic... along with having deep resolve and willpower. Shinji's got the 'scream' part of 'push the levers and scream', but he's missing most of the spit and vinegar. Dangerous, fight-loving Shinji would be fun, though, so transpose Ryoma onto Shinji. Rei's got none of that whatsoever, so add the necessary elements from Go (from Armaggeddon), who is similarly quiet ('horseshoes and hand grenades', as they say), and hammer to fit. Asuka you can nearly leave as is, at least superficially.
Set it in an AU Getter Robo universe. The 'evangelion' is a fusion of the essential properties of evas (neural interface, AT fields, etc.) with getter machines than pure evas--biomechanical probably. Makes more sense than an Evangelion, in a world with getter machines running around, and it's cool besides--plus, then you can posit a relationship between getter rays and something important later on. Anyway, call it 'Neon Getter Robo E' (since Getter Robo E sounds too much like a regular Getter Robo) or something--a nice Getter-y name with some NGE flavor thrown in. Throw Shinji, Asuka, and Rei in getters 1,2, and 3 respectively. Have Professor Saotome (and possibly Michiru) assinated in the backstory by SEELE's or Gendo's actions (for some evil reason or another) and the original getter team alive, with operation getter machines (Shin would be interesting and dangerous) for extra chaotic fun. Have them fight, like, a billion angels instead of the number in NGE--and never mind sense, as the purpose of a Getter Robo story is more to be awesome than make sense. Stir, and leave sitting 2-4 minutes until cool. Name it something Getter Robo-y, like "Neon Getter Robo E vs. Shin Getter Robo" and serve. Two great tastes that go great together!
From what I've seen (Shin Getter Robo: Armaggeddon, and some of New Getter Robo), piloting a getter machine more or less requires a certain measure of spit and vinegar and/or being a dangerous lunatic... along with having deep resolve and willpower. Shinji's got the 'scream' part of 'push the levers and scream', but he's missing most of the spit and vinegar. Dangerous, fight-loving Shinji would be fun, though, so transpose Ryoma onto Shinji. Rei's got none of that whatsoever, so add the necessary elements from Go (from Armaggeddon), who is similarly quiet ('horseshoes and hand grenades', as they say), and hammer to fit. Asuka you can nearly leave as is, at least superficially.
Set it in an AU Getter Robo universe. The 'evangelion' is a fusion of the essential properties of evas (neural interface, AT fields, etc.) with getter machines than pure evas--biomechanical probably. Makes more sense than an Evangelion, in a world with getter machines running around, and it's cool besides--plus, then you can posit a relationship between getter rays and something important later on. Anyway, call it 'Neon Getter Robo E' (since Getter Robo E sounds too much like a regular Getter Robo) or something--a nice Getter-y name with some NGE flavor thrown in. Throw Shinji, Asuka, and Rei in getters 1,2, and 3 respectively. Have Professor Saotome (and possibly Michiru) assinated in the backstory by SEELE's or Gendo's actions (for some evil reason or another) and the original getter team alive, with operation getter machines (Shin would be interesting and dangerous) for extra chaotic fun. Have them fight, like, a billion angels instead of the number in NGE--and never mind sense, as the purpose of a Getter Robo story is more to be awesome than make sense. Stir, and leave sitting 2-4 minutes until cool. Name it something Getter Robo-y, like "Neon Getter Robo E vs. Shin Getter Robo" and serve. Two great tastes that go great together!