I drew counterparts to team S.C.U.M! These are the rivals to the ladies. From left to right we have:

Tony the Pig (Speed: 2, Power: 2, Technique: 3): Tony is a pig who used to work as a police officer (he eventually got fed up with the 'pig'-related jokes and quit). Back as an officer, he hated criminals with a passion, especially drunks. So naturally, he's developed a lot of animosity with Caroline. A stocky and aggressive fighter, who people often tend to underestimate because of this. His combat experience is extremely valuable.

Brian the Elephant (Speed: 3, Power: 2, Technique: 2): Brian is the youngest among the group, with not much history. He seems to have an unlimited energy source, and can move insanely fast for his size! Since his species is already known for it's immense strength, this combination of speed and weight is golden for Brian. His youth and inexperience is the only thing preventing him from unleashing his full potential, but he learns fast. Seeing the boisterous and strong Sandy in action, he has picked her as a rival, wanting to learn everything he can from her with glee.

Stanley the Bear (Speed 2, Power: 2, Technique: 2): Stanley is the leader of B.U.S.T but not it's strongest member. He's decent at most everything, but not particularly special. This is something that always bothered him. Stanley has some personal issues with Ursula, who used to bully him horribly when they were younger. Some people speculate he formed the team specifically to torment Ursula. Others think he's just trying to make up for being mediocre.

Uri the Hippo (Speed 2, Power: 3, Technique: 2): Uri is a legendary cage wrestler, renowned throughout the fighting scene for both his fighting prowess as well as his monstrous strength, and for always projecting a silent but stoic aura. A prodigy since childhood, Uri has always strived for perfection and is deadly serious about everything he does. After meeting Melissa, the two found themselves locking eyes and immediately declared each other mortal rivals, without even saying a word.

As you can see, their stats are by default slightly higher than team S.C.U.M, and they all have advantage over their designated rival (Tony has technique to counter Caroline's lack of reflexes, Brian is fast enough to evade Sandy's slow attacks, and Uri is strong enough to overpower the frail Melissa). The only one who lacks significant advantage is Stanley (same stats as Ursula). But Stanley has a lot of tricks up his sleeve (and Ursula has horrible luck)!

Again, pick your favorite!