The Tinkerer

Here is another villain rumor for Spider-Man: Homecoming, ever since the Vulture became the main candidate for the role of main baddie. In his research, Toomes will be aided by Phineas Mason as he develops the exosuit. And, of course, Phineas Mason is better known as the Tinkerer, an evil genius who can develop the most amazing gadgets from the most common materials.
As in the comics, for the most part, the Tinkerer from Spider-Man: Homecoming will not be a major villain. Instead, he will just aid the Vulture, and he will most likely work for Osborn. And, if I would make a bet, I’d say that he is an ex-HYDRA scientist.
What will his role be in the movie? I guess he would be like a second Arnim Zola. You know – the guy with the good ideas who plays second fiddle to the more important villain. Only in this case he will be the third fiddle, since Vulture and Osborn will have the more important roles.
