Zords (Power Rangers franchise and two Super Sentai series)
Various named Sentai mecha (Super Sentai franchise)
Titan (Sym-Bionic Titan)
Gundams (Gundam series)
Variable Fighters (Compilation of Macross)
Super Robot (Super Robot Monkey Team Hyper Force Go!)
Big O (Big O)
The Spectre (Professor Layton series)
Testujin (Tetsujin 28-go)
Getter-1, Getter Dragon, and Shin Getter-1 (Getter Robo)
Evangelion Unit 01 (Neon Genesis Evangelion)
Unit 00 (Neon Genesis Evangelion)
Unit 02 (Neon Genesis Evangelion)
Unit 03 (Neon Genesis Evangelion)
Unit 04 (Neon Genesis Evangelion)
Unit 05 (Neon Genesis Evangelion)
Gunman (Tengen Toppa Gurren Lagann)
Iron Pirate Franky Shogun/Iron Pirate General Franky (One Piece)
Eggsterminator (Sonic X)
Phoenix-Buster armor (Marvel Comics); "Avengers vs. X-Men" event only
Jaegers (Pacific Rim)
Mobile Suits (Gundam Series)
Knightmare Frames (Code Geass)
Gurren Lagann (Gurren Lagann)
God-Killer armor (Marvel Comics)
Various Robo Ride armors (Mega Man X series)
Little Aloha (Space Dandy)
Cybodies (Star Driver)
Idol (Tenchi Muyo! GXP)
The Octobot King (Splatoon)
Titan Suit (Jak II)
Ecto-Skeleton (Danny Phantom)
The Black Knight (Sly Cooper: Thieves in Time) is a mechanical mecha Penelope created who's using a rocket launcher...
.. and later upgraded with a laser and a shield.
Jak's Titan Suit (Jak II)
The Nega Egg Wisp (Sonic the Hedgehog) is one of Eggman's final battle mechas.
Koala (Rave Master) with His DarkBring Machinery can create robots and pilot them as well.
EVA-pilots (Neon Genesis Evangelion)
Battle Jacket (Dragon Ball)
Emperor Pilaf and his minions (Dragon Ball) in their "Pilaf Machines".
The Power Rangers (Power Rangers) are well known for their various Megazords such as the Dinozord. Additionally the Super Sentai franchise that Power Rangers was based off of have a long standing tradition of using various mecha as part of each of their series.
Being a mechanical engineering genius, Tron Bonne (Megaman Legends) is able to create small robots called Servbots and pilot large aerial battles ships and mechs.
Despite being a small, petite girl, Heloise (Jimmy Two-Shoes) is very intelligent and sadistic as she makes inventions for Misery Inc. that would spread misery to her town and also likes to destroy things for fun.
Gurren Lagann (Tenna Toppa Gurren Lagann)
Dandy (Space Dandy) makes up for his lack of proper combat skills by utilizing his mech, Little Aloha.
E-99 Eggsterminator (Sonic X) is a powerful robot mech created by Dr. Eggman. Being powered by six of the seven Chaos Emeralds, it was enough to surpass Sonic in both strength and speed.
DJ Octavio (Splatoon) pilots the Octobot King.
D.Va (Overwatch) is a master mech pilot despite being only 18 years old.
The Ecto-Skeleton (Danny Phantom) was capable of amplifying Danny's ghost powers 100 fold, but at the cost of drastically exhausting his body.