I wan't to be able to explore replayability in terms of plot. Also I'm a huge fan of Diablo-type games.
I dream of doing an action rpg loot game with randomized story just as it has randomized dungeons/levels.
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Something between Front Mission and Frozen Synapse maybe?
Sort of turn based strategy with synchronous action during the gameplay.
I would definitely do something like DMC series, but it would be with RPG elements. I don't mean grinding for gold and better gear I mean "Witcher" sample. Player would have choices to make and there would be many different variations and endings. Ah... what a dream...
I would really love to make an update to the Bad Dudes acrade game by Data East. One of my all-time favorite 80s games. Are YOU bad? I'm bad. Badder than Michael Jackson!
Mine would be the Next Star Wars Battlefront...I Loved that game,
The Vehicles, Space Combat, Co Op, Was Great
Something like an RPG with combat inspired by paper mario, but deals with a more 'Souls' style story.
That or a medieval gunstar heroes.
Now that I think about it, I think a game similar to dragon crystal/fatal labyrinth (master system and megadrive) would be my choice, but more like eternal quest on ps2 for the mechanics.
I know it is one of the least popular type of game though.