I'm quite undecided, so, I will give you answer for all of them and you can pick the most interesting:
Alfredo (13yr old Kid with the green tank top)
- His fighting style is more toward a defensive "Hit and Run" and revolves around kicking, as He is very fast and agile, and his shoes have iron tips on the inside to deal damage and protect his feet!
Eva (18yr old Poison Dart frog girl)
- Her fighitng style is similar as Alfredo's (As they train together and have similar type of shoes), but She is more on the offensive when its about Kicking, and tends to be quite aggressive, especially if the adversary is on the ground, she will keep kicking him with no mercy until it is total Knock-out!
Ivan (19yr old Half Giant with Silver Hairs)
- His fighitng style instead revolves a more traditional use of Sword, as He used to practice fencing when He was younger, altough, He first proceed to analyze the situation, and then decide whenever to attack or defend, He is quite methodical in such regards.
Jadie (The woman behind the group and Alfredo's Mother)
- She is a bouncer in the Pub she works on, so, Her style revolve around submit the adversary, grab it, and then, throw it away, or flail it around like a potato sack.
Gene Ventura (The bearded man in grey)
- Brute force, He loves to beat up people like in a Bar fight, with a constant smile on his face, like not taking the situation seriously... We can say he is a master of "Drunk-Fu" without being Drunk, but rather, not even trying.
For the last point, I don't understand clearly, I should make the announcement after you confirm to have picked one character? Or I have to write it here?!
All this said, Cheers!