The Whipit’s logo is normally pink, it has been painted black on this ‘Mech so you can see it! This figure has been heavily modified, you can find the standard version at the link below.
Ace’s insignia, a pink cat’s paw, is placed on the left heel of all Whipits BattleMechs, regardless of the member’s chosen color scheme. This insignia refers to Ace’s Panther, which is painted light pink. Per FM: Mercenaries Supplemental II, page 20.