Mugen builds are distributed via third-party sites. Always use virus protection. I cannot provide direct links, but here is the general roadmap:

With so many characters, balance varies widely. Some entries are highly tuned by creators; others are faithful ports from other M.U.G.E.N packs and may be overpowered or underdeveloped. Competitive scenes typically use agreed lists or bans to ensure fair play. Matches are fast-paced when top-tier characters meet, while matchups involving niche characters can lean toward fun and unpredictability.