Not every character was built for an 8v8 environment. Here is a quick compatibility guide:

In the world of M.U.G.E.N, "8v8" typically refers to expanding the maximum number of fighters in (Simultaneous) or Tag modes beyond the standard two-player limit. While original M.U.G.E.N is restricted by its source code, modern engines like Ikemen GO offer direct ways to achieve this massive scale. Methods for 8v8 Battles

Defense is nearly impossible. Blocking requires facing the attacker. With enemies on both sides, you are always open. The patch often introduces a “parry all” or “auto-block from behind” mechanic, but traditionalists disable this, leading to matches ending in 15 seconds. The only viable defense is invincibility frames on wake-up —every character needs a DP (Dragon Punch) or a teleport.