Yu☆Gi☆Oh! Zexal Second

Both are anime series produced by Konami off of a certain game (ZOE for a video game and YGO for a card game) Though different, Zexal II has one of the monsters named Number 107 Tachyon Dragon that highly resembles to an orbital frame from the ZOE series Despite not being great, they still stand up to their own series to their fanbase 

Conflict between the Earth Duelists vs the Seven Barian Emperors is reminiscent to that of the Seven Seals vs the Seven Angels. Casualty count is pretty high that sets the dark mood of both shows and to the extent that the friend of the protagonists becomes his ultimate rival whose role is the opposite of his to determine the fate of the entire world at stake. Both series have letter X in their titles. 

Both are anime series produced by Konami off of a certain game (ZOE for a video game and YGO for a card game) Though different, Zexal II has one of the monsters named Number 107 Tachyon Dragon that highly resembles to an orbital frame from the ZOE series Despite not being great, they still stand up to their own series to their fanbase 

Both are 2nd half of the previous installment and are well regarded in pacing, lore, development, and art. Nasch and Zero are identical with little sisters and rivalry with a white suit donned protag. Also Hope resembles to that of Lancelot. 

Zexal II is when it becomes one to Madoka after being this much lighthearted only to get dark with the true notion that one does not get judged for the book by it's cover There are still light hearted moments and comedy but the majority of those are absent in Zexal II since Zexal II takes the story to a bigger stage left off by Zexal I. 

- Aside from both of them being long running shonen titles, the episode count for ZEXAL is only 2 less than Hunter. - Both ran from 2011 to 2014. - The protagonist of both is an optimistic young boy who's goal is to not only find his father, but to be just as skilled a Hunter/Duelist(respectively) he's said to be. Not to mention both of their fathers are adventurers who explore and study ruins and plan for bigger things, not of this world. -The fathers of both characters may be absent, but they leave clues for their sons, one isn't very overt about it and comes off as nonchalant, the other sends a whole person. - Something very similar with both is that at some point the plot revolves around collecting 100(ok one is 99 but they sorta implement more so it's whatever) numbered cards, the collection of these cards is the focus at the start, but eventually takes a step back for drama between the characters to shine. - The protagonists are extremely friendly and cheerful, and also kind of dumb, and they are accompanied by a character who starts out lonely and cynical, but eventually becomes cheerful. Both of these pairs of characters consider eachother their most or one of their most precious thing. They also know they'll have to part with them someday. - Both series feature a character who is a hunter of sorts with a companion that's more of a tool than a friend, that have a consciousness and can speak and assist said character in their hunts. These two characters are both experimenting/researching information about things not of this word that could threaten it. Both of these characters pass and are brought back in some way at the end of the story. - Grey haired cat girl(kind of?) who often makes cat puns. - Both feature a creepy psychopath who isn't exactly a hero nor a villain. There are more related things but personally I think ZEXAL is a much richer show, it's entire cast has an absolutely perfect dynamic and none of the characters really feel unnecessary, and I know the ranking of it is worrying, but it's something worth watching for the plot, the characters, and all the emotions that come along with that. Obviously since it's Yu-Gi-Oh!, it requires the viewer to utilize their suspension of disbelief, but the narrative is worth enduring it.  read more 

Yu-gi-oh! Zexal Second's group of antagonists-"barians" are extremely similar to altarians. Nasch and Yuma's relationship is quite similiar to Jin and Yunoha's, as they both end up being seperated just because they're from different worlds. It also has quite a sci-fi theme, but instead of card games they fight using robots.  

Dimensional travel / Time travel. Augmented reality and a time stream riding hover bike. Both kids monster anime that feature futuristic tech!  

Both children's monster anime with similar themes. Evil Moo (monster rancher villain) reminds me of the Barians (Zexal villains) in style and presentation. Both English dubs have great openings and OSTs. 

Classic children's "monster battler" series, both have mysterious evil forces/organisations of questionable origin. Both follow groups of young heroes on a righteous journey to help their friends and save the world! 

These are both from classic kids monster battling anime franchises, both are later generations and also second iterations of their respective generations. Both have similar main characters with Yuma & Gingka, and both also have great English dubs and soundtracks. 

These are both second iterations of similar classic monster battling style kids anime. Both have monsters sealed with inanimate objects (disks/cards). Both have sentient non-human characters. Both shows have very similar tones are likely targeted at the exact same demographic. 

The characters looks very similar, both physically and mentally. Special and bizarre hairstyles of many characters. The plot is quite dark, and there are many foolish villains.