Knuckerine

Thats badass and it actually fits them. Think about it:

·Both Knuckles and Logan are expert Martial Artists. Knuckles excelling in Kickboxing and Boxing while Logan excells in Kendo and Swordplay.

·Both of them have serious anger issues. (Its true though. Read the comics and you'll see.)

·Both are very well disciplend and will seek independent solitude (if needed for self-emotinall conflict, training or other purposes).

·Both despise atrocious villians:
Knuckles = Eggman, Metarex, and a bunch of others I cant think of at the moment...
Logan= Sabertooth (despite being brothers), Magneto ( despite past team-ups), The Silver Samurai and etc...

·They also hate some qualities of friends and allies. For example:

Knuckles hates Sonic's carefree and upbeat attitude, also the fact that he cant take some things seriously.

Logan hates Scott for various reasons including his personality, leadership skills, reasoning and a bunch of others. (Including the fact that they both like the same girl)

These two make a nearly perfect match for each other if you really think about it.😀