Felipe Meyer

I give you Antman III, another son of Antman I and Wasp.

The Sewer Rats

well... "Sewer Rats" is my "mystical" attempt to this contest.

Valerie is the daughter of Wong (first apprentice of Doctor Strange), who was seduced by the devious Lilith.
Boris is the son of Rick and Margo Jones, and apparently has inherited the Hulk's powers (owned by his father in the past).
Abomination II is the son of the inhuman Triton and the Atlantean-clone Namorita. He is a mutant, and have not been exposed to the terrigen mists.
Next on our list is Arachis, son of Peter Parker and Mary Jane. Arachis (born Ben Parker) has traveled the world looking for super-powers like his father's, and found it in Wundagore, where the High Evolutionary mutated him in an humanoid spider.
Finally, we have Golem, son of Demolition Man and Vagabond. Golem was took as hostage by reminiscent members of project Power Broker, and submitted to different kinds of experiences, that gave him superhuman strength but has deformed his body in a kind of rock-skin.
The sewer rats are superbeings that, for some reason (like appearance or the vulnerability to the sun, like Valerie's) have to hide themselves from the society. Living in undergrounds, they fight to survive in a world of monsters and inexplicable forces.
Again, these bios could look really better if my English wasn't so poor :)
Valerie Boris Abomination II Arachis Golum

Phoenix Force

Bluff (Rogue + Gambit)

Supernova (Magma + Empath)

Shield (Rusty + Skids)

Micromax II (Micromax I + Kate McClelan)

and Phoenix (Cyclops + Jean Grey. This is not the Rachel Summers that we all know, but a young woman born in this current timeline).
Bluff Micromax II Shield Supernova Phoenix

X-Men

X-Men

Colossus II (Colossus + Shadowcat)

Flare (Syrin + Warpath)

Bullet (Cannonball + Meltdown)

Ebano (Sunspot + M)

Ronin (Wolverine + Elektra)

and Corsair II (Cyclops + Phoenix)
Colossus II Bullet Flare Ebano Ronin Corsair II

Fantastic 5

Powerhouse II (Caitlin Power) - Reuniting all the powers of the Power Pack, Powerhouse is a very dangerous woman, daughter of Franklin Richards and Julie Power.
Overclock (Otto Lang Vernhard) - Son of Kristoff Vernhard and Stinger, Overclock reconstructed his own body with all technology sources, in order to become a great warrior.

Giant (Solomon Grimm) and Midget (Alexander Grimm) - The nicknames was given by each other. Solomon is son of the first Thing's marriage, with Alicia Masters. Alexander is the younger one, son of Thing and his second wife, Sharon Ventura. Besides the size, the two of them rivals in strength and resistance.

Insect Man (Scott Jones) - Fruit of an short affair between Scott Lang, the Antman, and the private eye formerly know as Jewell, Jessica Jones, Scott was created only by his mother, and never wanted to know his father... Until Lang's death. Then, Scott became Insect man, with limited super-strength (his mother's heritage) and shrinking/enlarging powers (his father's technology).

Lady Adventure, daughter of Captain Adventure and Hericane
Adventure Man, son of Captain Adventure and Hericane, younger brother of Lady Adventure
The Adventure Family

The Devils

Demonica (Blackheart + Dagger) - The Devil's son, Blackheart, decided to bring a child of his own heritage to the mortal world. He chosen a pure woman, Tandy Bowen, and raped her. By this abnormal union, has born Demonica, who was took of her mother right after birth, and educated without any moral or compassion by her father.

Bones (Crossbones + Diamondback) - A short affair between Diamondback and Crossbones brought Bones to this world. After his mom's death, he felt by the Nazi ideals of Red Skull.

Miss Web (Julie Power + Scarlet Spider) - The young college girl Julie Power has fall in love with a mature man, named Ben Reilly. Lots of friends warned her about the problems of the difference of age, but she couldn't imagine a major problem: Ben was the apparently dead Spiderman's clone, and he was continuing the work of the devious doctor Miles Warren.

Baal (Belasco + Magick) - Whit 17 years, Baal fell in limbo, just to found that he has born by a forbidden union between the sorcerer Belasco and the mutant Magick (who has die and returned to life so many times...). The experience made him insane, and obsessed by mystical arts.
"What if Mirza and Count Von Boros had a child...I know it's unfamiliar characters for the most of you... But what can I do if I love Brazilian comics? ;)

Note: These are not entries--these are the parents, the entry is below...
"Both parents are immortal beings. A vampire and a werewolf. In the adventures of Count Von Boros, he was described as a man with wishes to marry and have his own family, before he could find his cure. But... What if he couldn't find it? What if he found his place with a monster like him? By the devil's code, "Monster shall not fight monster". So they loved each other. And by this love, Victor Boros has born. An immortal being, too, damned to drink blood to survive. But, unlike his parents, Victor do not seek for a cure, or a purpose. Victor is a hideous modern monster, and all he wants is luxury, pleasure and violence."

The New Avenger's

"Burn, with power of pyrokinesis (son of Justice + Firestar, and sister of Voleur)
"Fleuma, who can increase/decrease his mass (Giant Man + Wasp)."
"Hulk Wingfoot, who can alternate between Hulk and Human shape (She-Hulk + Wyatt Wingfoot)."
"Lazarus, a young extra-dimension magical user (Dr. Strange + Clea)."
"Succubus, with great reflexes and martial arts training (Daredevil + Black Widow)."
"Voleur, with the power of teleportation, Daughter of Justice + Firestar, and sister of Burn."

"Valkyrie, very strong and with mystical powers (Thor + Sersi)."

"War Machine, killed and later reconstructed by AIM (Iron Man + Madame Masque)."

The Warriors

 "Monster Kid (adoptive son of the "alternative" couple Burn and Fleuma), he can morphs into Japanese monsters."
"Troll (son of Valkyrie and Hulk Wingfoot), the deviant; Troll has great strength and resistance."
"Ironfist II (son of War Machine II and Romanita), ruler of Latveria; Ironfist wears an armor with his grandpa's technology."