Interestingly, Mathilde seems to pray to the Gambler most (probably because luck is always useful), hold the Protector's ideals closest, and utilise the Deciever and Night Prowler's skills most often.
She's a fascinating Ranaldian.
She won't hesitate to manipulate, lie to, omit the truth to, or deceive even her honorable allies and even trusted superiors, and yet she is faithful to them all and has their back to the hilt.
She is an assassin, saboteur, and thief to her enemies and for when overwhelming necessity strikes, but the overwhelming majority of her time is in infrastructure, intelligence, and research. In building and inventing.
She studies dark magic and even necromancy to better defeat both, and is frustrated that she cannot teach others most of her insights without also teaching them the very arts she combats.
She often fights head-on, in the open, with a large and overt weapon and a loud and flash-creating gun.
She is a wizard of the Empire yet wields mostly dwarven gear.
She is a rich shareholder of a major company yet also adheres to the Vow of Poverty more than just as a matter of lip-service, in a way that suggests she values the mentality of the Vow of Poverty in itself.
The company she co-founded is a vast, fast-growing capitalist giant...for the purpose of being a loyal, above-board, reliable economic force in the Empire rather than a corrupt, greedy, dysfunctional tumor hampering the Empire. She has gone to great lengths to ensure that it is scrupulously honest and faithful in its dealings with dwarves.
Despite her grudge against Sigmar and distaste for his cult, she follows many of the ideals Sigmar stands for and championed in life: unity, proactively changing the world for the better, strength and courage against evil, fervor against the enemies of man, and being a good friend to the dwarves.
She meticulously and boldly gambles for the greater good in high-stakes scenarios, rarely for personal gain, relying often on audacity and clever use of manipulation and trickery against friend and foe alike.
She is a grey wizard who is good friends with a light wizard, a celestial wizard, multiple gold wizards, a witch hunter (two if you count Abelhelm, retroactively), and a number of dwarves. She's a stirlandian peasant-born girl who is friends with halflings. She's a knight with no horse and yet she's the fastest (ground-based) rider in the Empire.
She is an endless source of entertainment and fun for Ranald, while also being a true believer and noble twist on the Ranaldian archetype.