Monty Oum had said that everything has been decided for Weiss in her life, and because of it, she is a bit of a rebel. This manifests itself in her physical appearance as she wears her ponytail to the side of her head, disrupting the symmetry of the rest of her outfit. When Professor Port states that Weiss has received everything she wanted in life, she responds that it is not entirely true, thinking of her father's attitude. She takes pride in her name and the company, though, as seen when she first meets Blake Belladonna, when she discusses it with her team in Mountain Glenn and when she confronts her father over it.

Considering the lyrics of her leitmotif "Mirror Mirror", it is very likely that Weiss felt lonely throughout her life, which translated into a cold nature. Constant attacks by the White Fang added heavy strain to her life, explaining her often difficult personality. After warming up to people, she places a great deal of trust in her friends and confides in them when she feels the need without abandoning her usual strict attitude.

According to her voice actress, Kara Eberle, Weiss is "nice but can also be a little bit bitchy." She is irritable and confident in her abilities, though also acknowledges her deficiencies and the need to hone her skills further. Her confidence in her skills and intellect often comes off as arrogance to others. This is also mentioned by Kara, who called her the "know-it-all" type of person who also can become best friends with her acquaintances.

Weiss takes her time at Beacon more seriously than her teammates, even taking notes when the topic is not related to the knowledge she seeks. She equates such dedication in the classroom with dedication in the field. Thus, she is annoyed at those who do not take things seriously, especially when it comes to becoming protectors against the Grimm. Weiss remains calm and tactical during encounters and mentally coaches herself. She is thoughtful and fights with precision and coordination.

After speaking with Professor Port, Weiss' attitude appears to change, as she takes his suggestion to "be the best person [she] can be" to heart. She opens up to Ruby, though she does not halt future criticisms. Weiss' development carries into her whimsical and humorous side as she joins her team in a food fight against Team JNPR and a board game. In "Painting the Town...", Weiss attempts to joke but is met with negative criticism from Yang and Blake. Weiss also enjoys planning and participating in certain events, such as the Beacon Dance.

Weiss vows that as a Huntress, she will elevate the Schnee name from her father's dishonor to it and put her desires behind others' necessities. This solidifies in "Lesons Learned" when Weiss heeds her sister's advice and removes her bindings from the SDC to discover more about herself.