Ghaleon, the character you're looking for is defensively build Yuka spamming Flower Shot from the first slot.
Really? I like fast attacks but I was worried given its weaker formula and her lower mag to remi's attack, AND slower leveling, it would be an attack greatly weakened by enemies with non trivial MND. not to mention not being non-elemental doesn't help, but at least ntr isnt' a bad element... But....her elemental resists and status resists are better, maybe having more stat-oriented items instead of resist-oriented ones (which I prioritize on remi since her self-buff demands it to some extent), maybe that can compensate... I'll try it if I don't think further recommendations sound more plausible.
Alternatively:
Alice has staying power and damage, but she's also mostly a physical damage dealer.
Alice is weird... i thought she looked op on my first playthru, wasn't impressed but not upset at her either, I did end up taking her the whole game in but she never really stood out in the 'good' pile either. I didn't use her afterwards until a later playthru, at which point I found her to be more useful but still not a character I really really liked... She's fine, I don't disagree, but given that her nukes are more physical, just not applicable here.
Properly buffed 4th slot Rumia in a team that already has a healer has staying power (can take even Arrow Rain/Needle Parade if her defenses are buffed on a max MAG build, which she needs) and has good delay and damage on Moonlight Ray.
Actually I never used her after my first playthruf, which was ages ago, back before the wiki was up. Back then everyone ranted how much she stunk, and I was pretty much the only guy talking about how much moonlight ray really hurt. I didn't think she stunk. But by the later end of my run, I found she would end up dead nearly every boss fight, regardless of being a physical or magical boss. She really seemed squishier than I anticipated (other than sanae, that girl was truly a professional corpse). Now I know what bosses can do what, so I imagine I can anticipate threats to her better but.. I dunno, she still seemed really squishy back then. That also said, her nukes are mystic damage, which isn't really in demand. I'm one of the few peple who really like marisa, and one of the reasons why is because she can contribute constant dps via master spark without even being in the front for very long at all. I think of her as a hidden 5th slot character. I use master spark when her sp is only like 200ish sp each time (after a concentrate possibly), and despite mystic resists, she actually does good against bosses... not to mention she's a great trash cleaner as well given her high speed, and pretty decent mnd-piercing asteroid belt (and she's fast enough she can concentrate first, and THEN asteroid belt if you need to dent enemies with extreme defenses and you don't have kaggy/eiki/etc handy).
I was thinking about trying her again actually, but... I think yuuka looks more convincing...that said rumia is a beast in lot2 imo.
MAG Ran is fantastic, you should try her out.
I imagine she is. I have her with defensive levelup points, and most of her gear is defensive, yet every time I bump up her skill level in her offensive stats to other characters, she holds her own...Problem is I just love her party buffs so much. I like fighting bosses slow and steady, so the appeal for the smaller party buffs are that much more appealing to me because I really make the most of them for the entire party. Slow sounds like a bad thing to most people but bosses are the highlight to the game for me, so dragging them out in a safe manner isn't only... well.. safer, but even more fun for me! =P. Only causes problems with Baal guardian mostly (or is his wiki-level recommendation way low, unlike virtually every other boss in the game? I mean I know they're not perfectly accurate, but he is the only boss where I feel like the suggested level is actually on the low end of incorrect). desperation nuke bosses actually aren't much of an issue believe it or not.
Full MAG Eirin spamming Galaxy in a Pot with proper offensive buffs (I know you don't like her and this is the only reason she is not my first suggestion. but if properly buffed she's EXACTLY like Remilia but magical. the difference is that she can't get the buffs up herself)
Mokou using Fire Bird Phoenix also kinda sorta works. Not really, though.
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edit: oops, hit reply and forgot there were a few more lines to quote
Full MAG Eirin spamming Galaxy in a Pot with proper offensive buffs (I know you don't like her and this is the only reason she is not my first suggestion. but if properly buffed she's EXACTLY like Remilia but magical. the difference is that she can't get the buffs up herself)
Wait.. what... you know I don't like Eirin much outside of this game? Didn't think anyone really cared to remember my touhou character tastes. Eirin actually isn't someone I dislike much, but she's definately below average for me... the only characters I really say I dislike are reisen (her personality doesn't bother me exactly, but I'm a complete furry-phobe... I can't help it... I'm sorry, but seeing a girl with big bunny ears just kinda grosses me out, even when they aren't trying to be sexy.. the fact her meme is a 'only for sex-appeal' thing doesn't help) and Sanae (way too effing arrogant and holier-than-thou in the actual games, I'm not upset at the whole 'slut' meme or whatever).... And bear in mind I was considering using reisen as my magic-remi soo that shouldn't be too much of a factor IMO.
Mokou using Fire Bird Phoenix also kinda sorta works. Not really, though.
I considered using her for a first time after many times, but I just thought reisen is probably better in so many ways for what I want, particularly since discarder is the same element.