For us old guys...Mickey Mantle. One of the all time greats who tore his ACL his rookie season and played that way his entire 18-year career. His home plate to first base time (3.1 seconds) is still the record. To Baby Boomer boys like myself, he was the baseball star. Was out the end of 1961 when Roger Maris hit 61 homers. Pretty good chance Mantle could have beaten him that year. Always injured, (nearly) always hung over, Mantle was a remarkable talent.
As far as TCU guys go, I'll have to say Scott Ankrom. He as a phenomenal talent until he tore up his knee against SMU. He put more DBs on the ground with his moves than I have ever seen. Still holds the record with the longest pass play (99 yds, Ankrom to Maness) for TCU.