His mohawk, eye piece, and vest are all based on Star Fox Assault and Star Fox Command these details work well with his other biker motifs (which Ultimate also tries to incorporate) such as his beard (which Ultimate removed).
Brawl (' What's the matter, scared!?') and how he constantly tells his opponent ( and Fox in the Lylat Cruise stage) that 'I will be the one who will take you down' (fortunately, this Lylat Cruise dialog is retained in Super Smash Bros. I really liked his side taunt in Super Smash Bros. You can see how the spiked shoulder pads reflect light even in his official render for Super Smash Bros. Wolf's spiked shoulder pads are made of reflective material in Brawl they actually reflect different light depending on the stage (e.g., the lighting of Luigi's Mansion contrasts with the lighting of Skyworld). Of his attire, Wolf also wears a chain with a wolf symbol in Brawl and has a wolf shaped belt buckle. Brawl huffing while performing a complete jump on Final Destination note the chain clanking as he lands. He also huffs when he jumps the player even has to jump to the maximum jump height and not perform a hop or a short hop. His biker chain even clanks when he lands on a platform (only in Brawl). The version of Wolf from Brawl is my favorite, and he has incredible attention to detail. Brawl - with his sound effects from that game - were an option for Wolf in Super Smash Bros. I wish Wolf O'Donnell from Super Smash Bros.