Barcelona is indeed the favorite but Sevilla is a top La Liga team that cannot be underestimated, they are just underperforming in the last two seasons but when facing a top team of course they have much higher motivation, I think in this match there is a possibility for a surprise.
I think no team underestimates their opponents, especially Barcelona who have just developed at the beginning of this season, of course they have a focus on their team only so they can maintain their good performance.
The last few seasons for Sevilla have not been the best, but I agree that they have character and they can score points in matches with strong teams. The first thing you notice in Sevilla is a weak attack, and quite frequent red cards, although surprisingly, in the matches in which they receive a red card, they mostly win. And for Sevilla, Barcelona has always been an inconvenient opponent, even in the seasons when Sevilla was in the Eurocup zone, and now it seems to me that the difference between the teams is more noticeable and Barcelona should get their three points in this match.