Core Idea: A magic painter
Similar to Astra, or brim all of his/her abilities are placed via an overview map. This map will look like a painting of the entire map. Every ability you place has an effect on how much paint you have left.
Signature ability: Press E to draw lines that function like viper/harbor walls. Just without any debuffs, but can be place where you want and can also be placed in very short lines.
Basic abilities:
c: Draw something that that functions like a fade Seize and holds the player in that specific position.
q: Draw a thicker line that slows down enemies like a sage slow
Ult: Throw down a huge amount of paint on a specific area. Everybody in that area will be slowed to a snails pace.
I know this sounds potentially quiet strong, but I think there are many ways to balance this agent out. Limiting the amount of fuel you have, how long its active, giving abilities a high upwind time etc.