Yes on Jiu Wu, Ma Chao, and Ryuusei, no on Sumire and Kamio :3 The first three WILL fight back if attacked, to varying degrees of Bad Ending.
Ma Chao's more likely to let you hit him until you get bored, but he'll fight if he feels like he's actually in any danger; Jiu Wu and Ryuusei will kill you until you are dead if they have to (though Jiu Wu is slightly more likely to immobilize or otherwise incapacitate than Ryuusei). As with some of the other comments, there is a definite potential for mafia happening :D;;;
And as with the comment above me, a refresher course may be needed; it's been ten or fifteen years since I've read/watched any Sailor Moon :D;;;
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Ma Chao's more likely to let you hit him until you get bored, but he'll fight if he feels like he's actually in any danger; Jiu Wu and Ryuusei will kill you until you are dead if they have to (though Jiu Wu is slightly more likely to immobilize or otherwise incapacitate than Ryuusei). As with some of the other comments, there is a definite potential for mafia happening :D;;;
And as with the comment above me, a refresher course may be needed; it's been ten or fifteen years since I've read/watched any Sailor Moon :D;;;