First of all, the customization is fantastic. Seriously. Look up any video game character, and type 'Code Vein' at the end, and I guarantee that 90% of the time, someone will have them created in the Code Vein character creator. There's also lots of character slots, so you're free to create an outfit and save it for later.
I'd say the play style is a bit more similar to Bloodborne than Dark Souls, due to the offensive play style. However, from someone who has played both of those games, Code Vein has much smoother and easier to understand controls, as well as much easier class-building.
Also, one last thing; this game is not PvP when it comes to online mode. It's actually co-op! Hooray for the power of teamwork! :)