marisa isn't tough to do no bomb. the stage potion is harder. but since you allow deaths, she should fall quickly.
and yes, that'S what we're going to say, you didn't do a NB of MoF extra, even if you bombed her "easiest" spell. it's like me saying I did a NMNB of marisa because I died to something easy in the video I uploaded. not following your restrictions means you failed what you were aiming for. I don't mean it in a hostile manner, but bombing in a no bomb run, no matter how trivial the spellcard/stage section/non is, if you bomb, that's it for your restriction. next time eat the death, instead of destroying the run.
actually, I think you could go for NMNB on the easier extras (suwako, flandre, ran and koishi at least). though, I suppose that's still not for everybody.
anyway, congratz nonetheless on koishi. and also congratulations to everyone else. progress, no matter how small, is still progress. I mean, I was overjoyed when I beat 10-8 or 8-1 or 12-4 (it wasn't really that bad, but the last photo was mostly luckdodging) on 90 fps, anyway.