Character profile: Flint
He's the father of Lucas and Claus, Lucas' twin brother from the game, Japanese release only, "Mother 3"
He got separated from Lucas in the desert after a crazy desert tornado picked up. Think like one from the Mario level in double dash in the desert and that one humongous tornado.
Character profile: Palutena
Pit's goddess, can be seen in his Final Smash, has a trophy.
Character profile: Frog
Comes from the game Chrono Trigger, he's a knight from a kingdom whom is very civil and is well mannered, he protests the royal family and speaks in old English. In the Japenese version he's a badass whom is rude.
Play the game to know who this is.
Character profile: Pig mask in spider mech
He's on the dojo under bosses. In this story Eggman remade his mech. Play Earthbound and MOTHER 3 to know who this is.
Character profile: Masked Man
Look him up on wikipedia. Gun arm made by Smithy. Play MOTHER 3 to know who this is.
Character profile: Crono
The silent protagonist from Chrono Trigger, he is a swordsman and actually had Link's moveset before Link. There are many similarities in their moves if you play Smash and his game. He uses the element of lighting since that's the type of magic he possess.
Play the game to know who this is.
I'll do other characters when there time comes, and I don't do spoliers.