Bernard Hopkins for me. I became aware of him after the first Echols fight. He's the fighter that go me into the more technical side of boxing before him I just liked guys that were flashy and got KO's or had a ton of personality. After watching him I wanted to understand more about the sport in terms of why he was able to succeed despite not being the fastest or hardest hitting.
Roberto Duran, watching his fights taught me what to look for when studying a fighter plus he was a charismatic guy so it doesn't hurt to hear him too.
Alexander Povetkin. A shame he didn't have more big fights than he did. But I think he did well vs Wladmir and was treat badly. He gave AJ a good fight at old age. And produce an absolute insane shock KO vs Dillian Whyte which shook everyone. I think if he had gotten his match vs Wilder at around 35/36, he would have KO'd and become a champ. Loved his style and his constant respect for others he fought.
Childhood years - Ali teens/20s - Bruno (well I was a teen) McGuigan, Benn. 30's Calzage/Klits/Lewis (went off him at end) 40's/50's JMM/Fury/Joyce One pic - Ali.
For me, it's really hard to answer but right now, it's probably Usyk or Beterbiev. I just really like that goof ball Usyk and Beterbiev is just a monster, pity we don't see much of him.