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all in all great to use but very luck dependent until you get the Loaded Dice lategame.
Human combat is rare in ToTS 1, but obviously, when it does happen, you'll be glad you gave her a shotgun.
Combat Proficiencies
Glove: B
Knife: B
Bow: A
Gun: A
Non-Combat Proficiencies
Prowess: B
Knowlege: D
Skill: A
Charm: B
Club: Cooking
A lot of people sleep on Mary in Tera Steel 1 outside of her excellent recipe proficiencies and memes because, at first glance, she's the "jack of all trades, master of none" type, and you're already using Elise, a better all-rounder statistically, for 95% of the game. On easier difficulties, this is somewhat true, but thanks to ToTS's Nightmare Mode actually meaning something, even on NG+, she's got a lot of useful tools. First off is non-combat stuff: Mary might be second best at everything but Knowledge, but...she's second best at everything except knowledge. Because of how out-of-combat events work in ToTS 1 (see section 1.3 if you don't know what I'm referring to), that makes her a valuable addition to any party configuration, especially since the plot usually limits your choices. Theodora not available? You'll want Mariana for Charm checks. Atticus ninja vanished? Bring her along for acrobatics. No Erika for Knowledge checks? ....probably bring Jacinto, but you get my point.
Where it gets tricky is her Pokémon team. You see the list - Dragapult, Excadrill, Meowtwo Akira Top Percentage Meowstic Renne, etc - and think that you're building a damage and flinchhax team, and you think "I can build a better damage and flinchhax team with Elise". And you're right. Nothing is going to beat Rin with Tera-8L1B for sheer damage output except certain forms of advanced cheese from Nemona's Sunny or Thea's Sharon, and nothing's going to beat her for inflicting Flinch. On Hard and below when you can just faceroll things in a few turns with raw damage, Mary's squad can function as a second wave of screw-you DPS, but it's not really necessary with any kind of optimization.
On Nightmare, if you go this route, you're really missing out, and are gonna have a much more difficult game. Mary's actual specialty is battlefield control, with terrain moves, weather moves, status, etc. All it takes is a little investment in TMs and Roland can be the best DoT abuser in the game, with Will-o-Wisp, Curse, and Infestation, all of which stack, Infestation stacking with itself. Add in Sandstorm, Mud Slap/Dig/Earthquake to both damage and control movement, and the still-extant flinch moves, and the enemy will be lucky to even reach your party before they explode to DoTs (or Renne's artillery backing it up).
[TBA: late game party member commentary]
And on the rare occasion of human combat in 1, remember that Mary is the only character to get good proficiencies in both categories of ranged weapons, so swap out her default knife for a bow or a rifle if you want to use her there.
Combat Proficiencies
Glove: B
Knife: S
Sword: B
Non-Combat Proficiencies
