Alright, I guess it's time to answer some questions… In case you're wondering why, that's because I'd like to get things cleared up and not leave them to the assumptions of my readers.
**Question 1- Is the MC the same as Accelerator from the anime?.
Answer = He woke up in the DC verse with the same face, the same hair color and body, but they are not the same person.
**Question 2- Why doesn't he have access to his full powers like Accelerator does.
Answer = They have the same powers and the same looks but remember the one from the anime got inducted by scientists at a very young age and trained him to be as strong as he was by running multiple experiments with him. While the MC only just woke up with his powers not more than a year and is still learning.
**Question 3- Why is his power development moving at a slow pace.
Answer = That's because if he suddenly taps into a quarter of his full potential, he'd easily become OP and would need to start fighting characters that are on 6-A(Continent level) power level.
Trust me, the pace at which the novel progresses is worth it. If I rush things it'll leave everyone with more questions and it would seem like I'm just forcing plot and not being logical about certain things and situations.
I hope this answers some of your questions.