Let's be honest, most doa characters wouldn't have the moveset available to fight hordes of enemies.
Like, we have the ninjas.
and rachel, that is a ninja gaiden character....
and what else? maybe christie and bayman since those are characters that use guns...
Leon easily could. I could see his arm grenade decimating waves like a bfs swing. Let him use enemy bodies as weapons XD
Zack could as well due to his high speed kicking style. Same deal as naotara.
Christie is actually one of the worse options I think. She's like the Wei assassin in DW in that her moves are geared for single targets so shed be great against bosses but bad against mobs.
Bayman could use grenades and knives.
Mila could too.
Gen fu, jann Lee, hitomi, Ein, Nyo etc
Honestly a third to half the cast could work. Just a matter of deciding if they really need weapons or not