I'm fairly convinced Anrietta isn't worth the time.(Arc 3, Spoilers)

Few FAQS speak of her. I took the time to build her up to around the party's levels. 60-61 vs 65-68 for the rest. Opinion follows.

She has poor HP and poor MP. What makes it worse is she's an MP hog; her spells cost 20(Ruby Laser), 30(Diamond Shower), 40(Platinum Pressure), and 50(Jewellery Box). Why is this an issue? Look at the rest of the cast.

Velhart-Pure Bruiser, doesn't care about MAG or MP. After it's gone, he's still solid.

Marsia-Proper equip provides effectively infinite MP for the majority of her spells, and provides significantly more castings of Giga Plasma.

Cheryl: Spells don't cost much, has Rob Mind to recover MP.

Theo: Same as Cheryl.

Lutz: Spells don't cost much, is honestly about as Phys-oriented as Velhart thanks to having a vampiric weapon and can equip HP-restoring Heavy Armour.

Alec: Because he can equip everything, he can get 30 MP recovery if he wants to spell-spam(His spells don't cost much anyway), or not care and go brawler like Velhart(He can equip Life Stealer).

Atk base is poor, made up by her weapon, but since her weapon can't be changed, she's stuck as a pure melee fighter, and has no special effects, like regen, vampirism, range, etc.

Can equip both Heavy Armour and Robes. She has little business in heavy armour, as she wants the MAG boost and MP recovery she can get from Robes. Def is average or below, anyway.

She's quite fast, outspeeding everyone save Lutz and possibly Cheryl.(The issue is Cheryl's got 7-8 levels on her. I think Anri will outspeed her if they could get equal.)

Ruby Laser: Giga Plasma but cheaper and weaker, with 50% Paralysis.
Diamond Shower: Alec's Force Ring(Complete with the 50% Confusion chance), but more expensive and more powerful.
Platinum Pressure: One of the only player moves to inflict Gravity status. Targeting RANGE(The blue square) is 2. AOE(The White box) is as Force Ring or Marsia's spells.
Jewellery Box: A powerful heal, that also randomly adds ATK UP, MAG UP, DEF UP, or AGL UP. ATK UP, DEF UP, and AGL UP can be provided by other characters, but MAG UP can seemingly only come from this move.

Agree? Disagree? You decide.
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"I'm a Paladin. Preying on the weakminded is what I do."-Sashanan.

You know, if she could raise MAG reliably, she'd rank far higher to me as she'd be providing a buff no one else can. But it's attached to her heal(So you've got to be hurt to even try) and it's random whether you get the boost even if you've got ATK UP, DEF UP. and AGL UP on already.

Most non-Marcia spells have sucky damage and don't get boosts from much. Even the Rob spells aren't great(If only because of the splitting). Having a reliable booster would have been good.
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"I'm a Paladin. Preying on the weakminded is what I do."-Sashanan.