As armor they're pretty much the same, with human bodies they look a bit different (2003 has a bit darker hair + eyes, also dresses up as Ed in the movie lol). Their personalities are also different, 03 Al while still nice is wayyy more of a loose cannon than BH Al.
Comments
(first thing that came to mind upon seeing "little characters")
Rayman
Gordon Freeman
The Special Infected from L4D2
Idk... the Teletubbies maybe?
Who lives in a can of soup
He can’t ever leave
Either that or Edna from Incredibles
Always love seeing a PsychicPebbles doodle XD