Marsella is a member of the group to rob the bank of Spain. But he is not doing any work inside the bank.
He is outside and connecting professors and police calls. So that police cannot easily trace them. Marsella actually loves animals and It denied to learn surgery on Pig. Because of this, he got a confrontation with Denver.
Marsella Money Heist Wiki
Luka Peros Wiki
Luka Peroš is a Croatian actor and voice artist who voiced Patrick Star in the Croatian dub of SpongeBob SquarePants.
He voiced him from seasons 1 to 5. He also played the role of Marsella in Money Heist Part 3.