Please improve Darth Vader

You're showing a fundamental lack of understanding. Characters don't do the same thing in the same way. Vader has an AoE, but it doesn't work like Lando's. He has a spike, but it doesn't work like Biggs/Wedge. He has more hp than ST Han, but he doesn't tank (My Vader is 6*, level 80, health mods mostly 5* and ~level 9-12, gear rank 8. My Han is 7*, 81, maxed 5* health mods, gear 9. Vader's health/protection is only 5k less than Han's, despite the gear disparity).

All that is a valid, but incomplete, way to look at it. He hits harder than Han. His AoE sets up the rest of his team better than Lando. He can't be killed before acting, like Lando and Wedge. Biggs is meh without Wedge, but Vader is great without Palpatine and can still Culling Blade.

Vader is a character people MUST plan around. He's already incredibly strong, you're just looking at him wrong because you're a fan. Take off the nostalgia filter, dude!