Ooh, Ninjask is lowkey on of my favorites (I have a lot of favorites). His movepool doesn't give a lot to work with but sure, why not?
Ninjask has an extremely fast run and air mibility, as well as having three air jumps. However, he is extremely light and his attacks generally do very little damage.
Up Special - Aerial Ace. Ninjask quickly flies in a cirular loop at an upwards angle. Can snap to the ledge, but has short range. Good frame data but weak kill power. Mostly used as an out of shield option and combo finisher. Because Ninjask returns to his starting position it does not put him into special fall.
Neutral Special - X-Scissor. Makes two large slashes directly in front of Ninjask in the shape of an X. On of Ninjask's more powerful moves, good for catching spot dodges.
Side Special - U-turn. Ninjask quickly flies forwards then returns to his original spot. Smash inputting the move will increase its range. If spaced well, it can snap to the ledge. Good for catching landings and safe on shield on most characters if properly spaced.
Down Special - Sand Attack. Ninjask swipes the down, launching sand forwards close to the ground. It has a slashing hitbox and a sand hitbox. The sand doesn't make the target flinch but has a powerful windbox. The slash is a powerful kill move but has very short range. If used in the air, sand isn't launched.
I'll try Gallade, one of favorite Fighting-types!
Gallade has mostly average run speed (around Mario), but slightly above average air mobility (very slightly). His attacks are generally strong (like Link), and fairly quick. Has the ability Steadfast, which if he ever flinches to a weak hit, his speed (ground and air) increases by 10%.
U-special - Aerial Ace: A quick upwards slice in the air, similar to Simon and Richter's uppercut. Great for off the top KOs, and has decent vertical and horizontal distance due to the to angle the direction, but Gallade is left vulnerable if he misses.
N-special - Psycho Cut: A far-reaching horizontal slash in front of Gallade. However, it can be charged as well, and damages opponents who get too close to him. It KOs fairly easily when fully charged (think of Marth's Shield Breaker for instance) and can still keep opponents away at low percent, but has a bit of endlag (couple of additional frames, perhaps) in order to prevent spamming.
S-special - Night Slash: A slash with a dark effect added to it. Has a unique critical hit effect, in which it has almost enough launch power to one-hit KO, but has a 1-in-20 chance of happening. Quicker than Psycho Cut, but slightly weaker.
D-special - Swords Dance: Gallade hold out his hands above his head, and does a chant to summon a clanking group of swords (later SD animation reference). Raises damage values by 20% for 15 seconds. However, charging takes three seconds, and it must be uninterrupted, or the Swords Dance only raises damage values by 5%.
Final Smash - Final Duel: This is original material, being a mix of two moves. Gallade transforms into Mega Gallade dashes across the stage (going through opponents through the stage), and if he hits anybody during the dash, they are sent to a regular route (with ample space), and Gallade first uses Psycho Cut on opponents at high speed for a few seconds, then unleashes Close Combat for the KO.
Gallade is only male, as that's how it is in Pokémon. I won't get started on Gardevoir though.