1.Nightwing & Bucky
2.Captain America & Batman
3.Spider-Man & US Agent
4.Ironfist,Shang Chi & Luke Cage
5.Deadpool,Deathstroke & Elektra
6.Classic Wonder Man & Namor the Sub-Mariner
7.Kurse & Mr Hyde
He regenerated from being completly turned into a blob by Madison Jeffries in a second. He basically completly invulnerable. Death Metal would basically steam roll everyone by himself except Kurse.
--------------------------------------------- Battles
--------------------------------------------- Death Metal vs. Genetix #1 [Vol.1]: Death Metal
Here Jeffries rips apart Death Metal like he is nothing, but as noted thanks to being mysticaly created Death Metal can reform and beats Jeffries. Still a interesting feat. He even wishes to create an offspring from Jeffries DNA so it could defeat or contain him.
He took it to Alpha Flight, as they did vastly more damage to him but no matter what happened he kept reforming. Alpha Flight eventually won using Aurora's healing light on him and ended the fight, but physically he was just unstoppable.
Also you can't BFR remove him as he can teleport as well, Genetix tried and failed.