For me, the hardest battles in Grandia 2 were Eye of Valmar, Valmer's Claw, and Melfice (tacking him at Lv 30 is scary.) From that point on, resources shift in my favor as my team has enough MP to last a drawn out battle and enough SP so that members can use their techs more than twice on a full tank. Actually cruised through the game without needing to retry battles and slacking on keeping my equipment up to date until Valmar's Eye walled me hard. Everyone ran out of MP and I used most of my recovery items. Still ended with one character dead and I probably only got past because the main body got stuck somehow. Then Valmar's Claw comes by and nearly empties what HP recovery items I had left and managed to build back up. One Healing Herb and one Holy Wound Salve were all I could lay claim to after that struggle. Nothing quite as troublesome as that trio for the rest of the game other than Valmar Core (Devils at Raul Hills nonwithstanding)
Got a really strong LUNAR vibe from the story and progression as I went through (not really shocking given the developer) that I ended up making lots of comparisons in my head. Sometimes I refer to the real main antagonist as not-Zophar, the ugly forms even ooze blackness in nearly the same way.
Just for amusement, I even made my own list of which LUNAR character the cast is most like.
Ryudo:
OK, I'm stumped here since I don't recall anyone in LUNAR being so jaded and cynical. Has most in common with Jean I guess with the whole "running away from past and eventually confronting it over the course of the game" act going on. Their exterior personas are radically different though.
Skye: Nall The non-human sidekick Mostly there to make wisecracks and stick with the male lead through anything.
Elena: Luna Really talented singer, has feelings for male lead but mostly conceals them, jealous at the idea of him being with another. Also good at being a healer and low on the offense stats in battle. I feel they share the same sense of righteousness too.
Millenia: Ruby Hot tempered, likes the male lead and is rather clingy about it, enjoys burning things. She's got most of Ruby's personality traits included being soft-hearted towards children. Though I doubt Ruby would dress that daringly in a human form.
Also, I find her battle quotes the most enjoyable by far. "Deep fried goodness!"
Roan:
Mabye Mia, they both have that polite demeanor in nearly every circumstance. Also pushed into leader roles at a young age and generally admired by the citizens of the communities they lead.
Mareg: Mel In battle, this is the closest one would get to a playable Hell Mel. Clobber stuff with an axe and leave the spell slinging to their teammates. Both are parental figures as well and act respectably off the battlefield.
Tio: Lucia Another easy comparison; both learn about human emotions through the course of their journey and their manner is very mechanical when they first appear. It's off the beaten path (stay the night in St. Heim after Tio joins) but Tio also gets a scene where another character experiences embarrassment because of her unfamiliarity with human conduct. Nowhere on the level of the hot springs scene but feels in a similar spirit.
Valmar: Zophar On a surface level, reminds me strongly of Zophar. Looking back, all that talk about preventing the Day of Darkness ought to have been a big tipoff that he would appear just like in LUNAR 2. The motivations seem more like a certain Magic Emperor.
Mostly playables right now, may or may not get around to others if I feel inspired to.