Dark Traveller
Striker
They already laid the seeds for Iron Man’s replacement in Infinity War. Pepper is pregnant and they name the baby after her crazy uncle Morgan. Morgan Stark is Tony’s cousin in the comics but I’m sure there was a timeline where she was his daughter and takes over the mantle of Iron Man
There is also Arno Stark, a bitter cousin of Tony, who finds it difficult to get out of the shadow of his predecessor as Iron Man 2020