Abasuto said:
I just beat everyone with SM, lost no rounds, didn't even continue. I got to fight Athena in heaven.
...which means you cleanly won without tick damage.
Why didn't I fight Red Arremer ?
...because you won cleanly without tick damage...
And how do I get to play as Athena and/or Red Arremer ?
They're only playable via debug/unibios.
Another c&p from Chris' SvC faq:
" ------------------------------------------------------------------------
PLAY AS THE FINAL BOSSES (AES console version only)
------------------------------------------------------------------------
There are codes to play as the final bosses, but they only work on the
AES version of SvC (as opposed to the MVS version, which is the kind
used in arcades). So, don't bother trying these codes in the arcade.
On the Character Select screen, hold Start to enable the random select
(aka roulette). While still holding Start, enter the following codes.
The directions listed are (r=right, l=left, d=down, u=up).
Shin Gouki l,u,u,r,u,d,d,r,l,l,u,d
Serious Mr. Karate u,l,u,d,r,r,d,l,u,l,r,r
Then press any Punch or Kick button while still holding Start. Unlike
the "mid-boss" codes, you must complete these codes before the timer
goes below 10. This means you have to input them fairly quickly.
Unfortunately, you can't use Athena or Red Arremer even on the AES
cart, although if you have a debug or universal BIOS installed, you
can turn on "developer mode", which will enable all the bosses.
They do not appear on the Character Select screen, but if you are
on the SNK side and push right while on the inner row of characters,
you will highlight a boss. The same applies to pressing left while
on the inner row of Capcom characters.
Thanks to Razoola for providing the information in this section."