Path of the Beast Barbarians, too.
Actually, this is a perfect way to play Venom. Not Eddie Brock, but Venom.
If you choose to be a Small Plasmoid, you can use one of your Medium party members as a mount, being flavored as you being bonded to them as Symbiote and Host. Then take the Mounted Combatant feat, and you can use your reaction to take a hit that your "Host" should have taken, symbolizing a Symbiote increasing the durability of their Host (which is actually really effective if you're on a squishy party member, because if you're raging, you have resistance to most of the attacks you'll be absorbing, and so you'll be a really effective Tank). The Evasion ability for your Host can be flavored as the Symbiote using its otherworldly senses to save the Host's skin, and the advantage on attacks against targets Smaller than your Host is similar to how a Symbiote is weaker without a Host.
Your Pseudopod is one of your tendrils that you use to manipulate objects from far away, your Bite attack is you transforming your host to bite enemies, your Tail attack is another one of your tendrils attacking an enemy (and protect you if you're targeted by an attack). The Movement enhancements from the Path of the Beast at level 6 perfectly fits your Symbiote nature, Infectious Fury could be you terrifying enemies to death or using a tendril to force an enemy to attack another enemy, and Call of the Hunt embodies your bond with your Host growing stronger, allowing them to take more hits and deal more damage with an attack.
As for your Host, I think Eddie Brock would probably be a Commoner that takes Sidekick Levels, probably being an Expert (wearing light armor reflavored as the Symbiote body protecting them, using the Help action as a bonus action to aid the Symbiote with its attacks, Coordinated Strikes to help the Symbiote deal more damage, etc). However, I could see an argument for Rogue or Warlock.