Discussing their underwater training, Letitia said: “For me, I was not going through as much as Tenoch (Huerta, the anti-hero in the film), but I did get to learn how to freedive from the fantastic team, yeah it’s a great life skill now.

Source: https://southasiandaily.com/letitia-wright-learned-a-life-skill-on-the-sets-of-black-panther-wakanda-forever/

The more notable of sympathetic MCU villains have come from the Michael B. Jordan's Killmonger and Tenoch Huerta's Namor ultimately wanting to do right by their culture and people, but going about it in the wrong ways.

Source: https://screenrant.com/guardians-galaxy-3-high-evolutionary-evil-actor-explained/