GetBackers, X Recommendations
These anime have many similarities.
In both the character design is good, but the animation quality goes up and down.
Both have some genres in common, such as action, drama, tragedy, and some comedy to lighten up the mood, and themes in common, such as granting wishes, fighting with ex-friends, protecting the loved ones, and world destruction.
Both can be quite psychological, even though Get Backers has more shounen elements and is less serious than X.
Both are about people who have supernatural powers (such as controlling electricity, just to name one).
Both have an ensemble cast of characters, and many bishounen.
In both there are 2 opposite factions that fight