Code Geass: Hangyaku no Lelouch, Fate/Zero Recommendations
Both of these series involve loads of chracters making intricate plans against each other for various motivations. There is action and a supernatural element in both. Code Geass has a lot of high school age characters while Fate/Zero mostly involves adults, and there are more not-so-serious episodes in Code Geass. Code Geass has mechs while Fate/Zero has swords and sorcery. But they both have more plotting and gambits than you can count. If you like that aspect of one, you'll almost certainly like the other.
In both anime the main character have a similar objetive, change the world. They know they can´t do it only with nice words so they are prepared to make sacrifices even if it means losing someone close they care/like/love.
Both shows have ideological conflicts and personal ideals.