There are lots of ways to make the character of Eddie Brock more interesting in this films series.
To begin with, they need to make him their own character. Because, let's be honest, Eddie Brock's origin in 616 comics was atrocious. He was just thrown in there.
This character has to be re-invented to give him reason, a real mature motivation, and history... and it starts first with Eddie Brock and the Symbiote individually; than second, the contrasting cause & effect that is Venom. Something they really never address, with any real reason, in the comics ,cartoon, and definitely not in his brief moment on film.
I simply prefer him to be a soulless person who possess very little regard to what we call the true embodiment of the human spirit. He has been bad person, a reprehensible and appalling human being, for
most of his life, as evident in the little trailer I have written below(for example). He knows no other way. Yet what little hope of redemption he
find, that could have possibly changed his life therefore, lays in a
casket. He is what he is; and now, has become what he has become
a threat to Spidey, and humanity itself.
With the reboot in all, I think the Venom spin-off should coincide with the rebooted Spidey franchise once the Spidey franchise introduce the Symbiote. Introduce solely, Eddie Brock in the Spidey reboot. Then the Spin-off could build & tell the story of Brock and him succumbing to the Symbiote; as well as, dealing with some nefarious adversaries(The Jury, a few of SHIELD Agents maybe, even Carnage created by Miles Warren), leading to a final climax versus Spidey, in a Spidey film. Thereby, not investing time on Brock/Symbiote/Venom characters in a Spidey film, allowing the rebooted Spidey franchise time to devote to other villains in it series of films.
Example: introduce Eddie as a small supporting cast member, introduce the Symbiote in Spidey3 maybe, with the creation of Venom being a cliffhanger at the end... unbeknown to Spidey. Spidey4 & 5 could feature other stories and villains; while simultaneously, Venom 1 & 2 takes place... with the two climaxing in Spidey6. Have the two films continuity mirror each other, til the films coincide with the final climax. How great would that be, with the anticipation of the two finally meet.
It would definitely be unique, never before done.... thinking outside the box.
Again, I prefer Venom to be the vicious/remorseless beast that he is; and, Eddie Brock to have a real foundation of who the man was before the bond. IMO, the film should re-invent the character and be based on this relentless combo as told from his POV
and maybe, just maybe, we can view and understand just why this unstoppable force is the greatest threat to Spidey and humanity.
 
This is why I propose they do two films(to coincide with Spidey4 & 5) in order to devote proper time in developing the character along the way, pierce into his psyche, and the effects of the Symbiote, as he approach his climatic confrontation with Spiderman. I know it will never happen and Im sure most can not imagine what Im saying or think should happen; however, Im trying to give a glimpse how it can be done. Heres a quick synopsis of the first of the two film.
 
Venom
 
Although the story starts off full of action, from the get-go, with Venom already existing; the story details the chronological path that lead Eddie Brock to the single event & revelation that change his life forever
and its not what you think. Unbeknownst as to why, he is being sought after by a fierce elite team of agents, as he search for the prime opportunity to strike, the source of his anguish and pain
and will kill any and everything, that get in his way. Heres a brief teaser.
 
The Following
PREVIEW Has Been Approved For
ALL AUDIENCES By The Motion Pictures Association Of America
 
The screen is black, the interlude of Phil Collins, In the Air Tonight continuous plays throughout, as Eddie Brock voice-over narrates.
 
My whole life, I have always been the antagonist. A quick scene fades in of a nine year old Brock throwing a ball with all of his intense might, at an opponent, in a game of dodge ball. The screen fades to black.
 
The one everyone gawks at
intensely. The next frame slowly fades in of Brock sinisterly smiles at his poor dodge ball victim, who nose drips blood. The screen fades to black.
 
I can feel their loathing gaze. A quick scene fades in of a fifteen year old Brock walking out of the schools restroom, smirking
with twelve dollars in his hand, as the student body stand by, repulsively watching. The screen fades to black.
 
I sense their disgust. The next frame fades in of a student stumbling out of the restroom shortly after Brock, drenched and messy, with a solemn look on his face as he collapse to his knees. The screen fades to black.
 
Because many detest me, A quick scene flashes of an twenty-one year old Brock stepping into the center of a circle with a bayonet, in the Iraqi desert. A soldier mouths out in searing jealousy,
kick his freaking ass Jimmy with soldiers, encompassing the circles outer fringes. The screen fades to black.
 
and most dread being near me, The next frame fades in of Brock delivering three quick blows(Matrix Style), thrust, 360
° side slap, uppercut. The screen fades to black.
 
I am alone. The vocals to the music begin.
I can feel it coming in the air tonight, oh Lord"
as the frame slowly shows Brock dropping the bayonet as he step out of the circle
leaving a bloody and bruised mess. As Phil continue to sing
Ive been waiting for this moment for all my life, oh Lord, of Lord"; another scene slowly fades into a 180
° panoramic shot of Brock standing in front of a casket.
 
The music instantly pauses, Eddie Brocks maniacal looking face appears on the screen, talking to the audience
But not any more. As the heavy drum interlude of In the Air Tonight plays
the Symbiote slowly covers, the distant, but angry look, on Brocks face. The screen and music suddenly goes blank