I would love Kunkka ult in Deadlock, also lore could be something todo with the flying dutchman which fits the theme of the game
Ability 2 sounds super cool ability for a pirate/captain, great concept
Ability 3 I would say is boring and could be replaced for something else
Ability 1 what's the purpose of the vertical rope? just to climb onto tall buildings?
Maybe instead of the anchor creating a rope (since a rope is already on ability 2) have the captain drop a spectral anchor directly from his body, dealing damage which increases based on how long the anchor was falling - so the higher you drop it from onto someone, the more damage it deals.
This way anchor is comboed nicely with 2 (swing and gain vertical height via 2, drop the anchor from high up for max. damage and drop onto the enemy)