I'm xRetri, i'm currently a legend Hudson/Bishop main. I've been playing since closed alpha and have been competing in show matches and scrims since.

Hudson

Hudson is a controller who specialises in holding ground and making peoples lives miserable if they decide to push into you. On top of this he has one of the potential highest DPS in the game. You want to be playing as safe as possible letting your team engage and positioning your barbed wires to cut off chokes and to make it difficult for the enemy hunters to move in a fight.

Items

Mana Blade > Rampage / Vampiric Blade > Last Stand

While Hudson does not really need mana, Rampage is a massive increase in damage and procs incredibly quickly. Each bullet is a stack of rampage so it will stack almost instantly.
Last Stand synergises really well with his RMB healing and can make him surprisingly tanky (Try to not get anti-healed in fights)
Drain Wisps synergise with Last Stand to give 200 HP/s while standing on a wisp.

Abilities

Passive: Hudson's passive has multiple effects which need to looked at. His most impactful is that he has an in-built armour soul. If you have full armour and see someone on low armour, swap with them and start repairing the broken armour, this has incredibly value over the course of a game.
Hudson will also additionally take 25% extra damage if hit from behind, this is one of the main reasons holding down RMB is so scary.
He will also gain health and armour when killing and knocking enemies.

Level 3 ability choice: For the level 3 ability you will want to go with barbed wires. level 3 on RMB adds 10% damage, which is nice but Hudson already has enough damage with this build. Level 3 on Dash gives additional dash time, this is nice but it's only an extra 0.6s dash time which isn't that impactful. Level 3 on Q is a 33% reduced cooldown on wires, which means 33% more uptime on them.

Spin Barrels: This is Hudson's bread and butter and his biggest skill hurdle. Holding this button down will melt anyone in your way, but it also makes you incredibly easy to punish since you have reduced move speed. You should only use this if you are: Safe, people are pushing into you, the enemy is stacked/CC'd or you are using your dash.

Hover Jets: A very powerful dash ability that makes you hover in the air (Works a little like hoverwings). Since you only have 1 dash you want to be very conservative with it and ensure you're using it to get away from danger instead of dashing in. Another thing to note of his dash is that it knocks back and does damage to anyone hit, you can use this to knock people into spikes or off into the abyss. You can also charge and shoot RMB while dashing and keep full dash speed.

Barbed Wires: Barbed wires are an incredible zoning tool. If you throw this down people can not walk over it or they will be grounded (grounded disables all movement abilities), this can stop pushes or make fights awkward for hunters that want to dash around a lot. Make sure you use the strategically instead of throwing 3 down in a single choke.

Salvage Hook: This is just Urgot ult. Hitting an enemy will mark them for 4 seconds, if they drop below 30% hp they will be eaten, instantly boxed and drop a passive armour health pack that teammates can pick up. You can also execute wisps with it. There is a small delay and it's a thin hitbox, it's the hardest part of his kit to hit. Using his ult will also reset the build up on his RMB, if you press ult it will allow you to instantly start turning and moving at full speed again.

Powers

Hudson needs protection and is fairly slow, any powers making him safer or mobile are usually a good pick, below i'll go over a couple of the stand outs:

Magnetic Vacuum: This is Hudson's strongest power. Crouching will suck enemy players in if they are in the air, and since Hudson is already slow he can play while holding crouch most of the time. You can also use it while dashing.
Armor Shredder: Hudson a good holder for this one. Big damage = big armour loss.
Hover Wings: This is essentially an extra dash.
Delicate Barrier: This will stop you getting one shot by heavy dive.
Abyss Specialist: Potentially unlimited dashes over the abyss (The reason this is lower because other hunters have a higher priority for this)
Sand Wall: A powerful defensive tool, this acts as a moving wall and can block almost every ability.
Air Blast: An extra 'get off me' button
Glider Jets: Glider Jets help with his low movement and will help him keep up with the team or run away if needed.

BUILDS

Tank

Damage

Hybrid