Kidou Senshi Gundam: The Origin

Both Gundam Origin and LotGH deal with war and politics, and have a really similar vibe. Char and Reinhard are similar characters, as they are both tactical geniuses and have hidden agendas. Furthermore, the space battles in Gundam (episode 5) reminded me a lot of those in LotGH. 

Both Thorfinn and Casval serve the murderers of their fathers, making a name for themselves as skilled merciless warriors on the battlefield in the hopes of an opportunity to take revenge upon their own leaders. Thorfinn lived humbly with under a caring father Thors, a Jomsviking war hero. We see his childhood as having fun, enjoying a naïve conception of fighting and war. They are forced to leave their life of peace and this impacts Thorfinn the most. Eventually, he joins Askeladd's band of Vikings to fight the Saxons, yet retaining his vengeful agenda. Casval, on the other hand was the son of a powerful political figure and his family was center stage in their home colony and must adapt to the life-threatening situation he's put in when his father is assassinated. Eventually, he enrolls the Zeon's military academy to fight the Earth Federation, with a secret agenda to change the Zeon government that corrupted his father's name and ideology.  read more 

If you enjoyed Code Geass, and liked the fact that the mc is a op, genius strategist and a skilled mecha pilot then Mobile Suit Gundam Origins has everything you are looking for, many people recommend anything distantly relate able to Code Geass but if there was one anime that was truly similar it would be this one, enjoy.  

Space opera and dark fantasy containing a teenager who gets involved in a war as a result of losing a loved one . He eventually developes an interesting talent for war and uses it for its vengeful purposes. It contains political conspiracy, childhood trauma, horrors of war and even some interesting military deployment . You have futuristic guns, spacecraft and mobile suits in Origin, while 3D maneuvers, chivalry and even the titans itself have same purposes in AoT.  

Both about ruthless blond haired aces rising through the ranks of their respective military factions.  

Revenge. It drives Casval and Angelo to commit unforgivable acts against those who have killed their families. Ready to adandon all ties to their identities, Casval and Angelo adopt new identities to infiltrate themselves within the inner circle of those who would kill them if they knew their past. Although Casval's revenge is only realized in the sequel, Mobile Suit Gundam: The Origin is the story that gives meaning to Casval's revenge. Of the two series, 91 Days is definitely the darker tale of revenge and benefits from being a pure drama. 

Space Battleship Yamato 2199 is a stunningly beautiful remake of a classic sci-fi anime from the 70s, we see the beloved crew of the Yamato and the dramatic ship-to-ship battles in modern animation. It adds new details too for more world building such as a more expansive history of the characters from the original, new crew members not seen in the original and more alien races in the Iscandar arc than just the Gamilas and others. While the manga of Mobile Suit Gundam The Origin is a remake of a classic sci-fi anime from the 70s, as of now, the OVA adapts the several-volume-spanning flash-back arc so it isn't technically a remake. However we do see some of the interesting characters from the original Mobile Suit Gundam in modern animation such as Char, the Zabis etc. We see side-characters and characters that were only mentioned in dialogue or appear in flashbacks in the 1979 series get a more sound and detailed story to them. The OVA expands on the details about the Earth Sphere we all watched in the original Mobile Suit Gundam. When I saw the space battles between Federation ships and Zeon ships in this OVA they really reminded me of the space battles in Space Battleship Yamato 2199. To summarize; both of these anime are remakes and or expansions of classic sci-fi anime from the 70s with a lot of world building and exciting battles. read more 

Both of these anime series show how brilliant blonde commanders rose to power, taking place before the military sci-fi epics we're more familiar with. Both Char and Reinhard were separated from their family members early on and care very much for their respective sisters, Sayla and Annerose. For a greater cause in society (the aristocracy, statehood, the environment etc.) and their personal grievances, Char and Reinhard are determined to change their nations from the inside. Although they serve different roles and have different abilities on the grand battlefield of space (Char more of a pilot than a tactician like Reinhard), they have very similar experiences and abilities outside of that environment. Because of their lineages, they are frequently subject to assassination attempts (Reinhard from rival nobles, Char from the Zabi family). Due to these assassination attempts, both anime series add excellent thriller and espionage aspects to the underlying mix of military and political drama. Because Char and Reinhard are also targets whilst not in space, they have to engage in hand-to-hand combat, swordfights and gunfights outside the shelter of a cockpit or bridge. As mobile suits aren't developed until the latter half of The Origin, there is a lot more ship-to-ship combat reminiscent of Legend of the Galactic Heroes, too. In summary, both of these anime have main characters with very similar experiences, offer intriguing political thriller, espionage and combat sequences of multiple varieties (ship-to-ship, dogfights, gunfights, swordfights and hand-to-hand). read more 

These top hit series focuses on the rival's point of view with the difference between DSOD as a sequel and Origin as a prequel