Knuckles the Echidna is a red fictional, anthropomorphic echidna, and one of the original characters from the Sonic the Hedgehog franchise. In the neutral timeline, he is less paranoid and grumpy, because snort.
The neutral timeline doesn't really exist though. Wait what? I don't even know anymore.
Knuckles the Echidna is the main characters of all the Lippies stories up to Lippies V.4, after that he was FINALLY replaced by Nyro the Leopard. Knuckles in Lippies V.3 looks similar to his official counterpart, however, his snout is notably longer, and his mouth is not on the side of his face (resembles older official drawings of him). His personality, on the other hand, is made to represent how Knuckles was SUPPOSED to be when he was first created, unlike now where he's really stupid (especially in Sonic Boom dear God). Also, he really hates romance, and DOESN'T HAVE A CRUSH ON ROUGE GOD
For some reason, in the bad timeline, Knuckles is half demon, because that makes sense.