Total Recommendations: 4
You my think how are these two similar one has to due with boxing and extreme workout while the other also has to due with training but this one has powers. Well Hajime no Ippo and Katekyo Hitman Reborn are alike. Both main characters start as wimps like they are no good. The main characters work there way up from being weak to being strong and they never give up. They both go through extreme training and they may complain but in the end when they are in a tough spot they out of the blue find a way to win. Both are long running series but as of now Katekyo Hitman reborn has more episodes but I would recommend to watch them both.
I say both of these are similiar. 11 eyes is still new but it kind of has some similarities with d gray man. They both have to due with some kind of enemy like in 11 eyes theres these weird bug looking monsters and in D gray man they have to due with akuma(demons) and the noah clan. Both have some sort of magic or weapon and they are both action packed series that I would recommend anyone to watch.
They both have to due with basically assassins. There are female shooters/assassins and of course males. They both have very great action and suspense that they are very great series to watch. Phantom has to due with organizations though and you can say prob canaan is like that but overall two great animes.
Both series are made by the same creator Mashima Hiro. Both contain action and has some comedy in it. Both have some sort of action like groove adventure rave has swords and it has powers or some type of weapon and Fairy Tail has magic. Fairy Tail just started so I cant really say much about it but Groove Adventure has a very great story line and I bet Fairy Tail will as well.