So this is what I decided on for the next party and the reasoning behind each one:
Nintendo Entertainment System
Contra: the final boss is a giant alien HEART. Also, these guys will share their lives with each other...when one of them gets game over first.
Joy Mech Fight (J): where there's love, there's joy...so there must be some love in JOY Mech Fight. Or robotic violence. (Plus, their "lives" are represented by HEARTS.)
River City Ransom: save your girlfriend from thugs. That's romantic, right? Plus, "ransom" is an anagram of "romans" which is kind of like "ROMANCE". Whatever, just go with it.
Super Nintendo Entertainment System
Rock 'N Roll Racing:
Black Sabbath - Paranoid: "Happiness I cannot feel and LOVE to me is so unreal."
Deep Purple - Highway Star: "I LOVE it and I need it!"
George Thorogood - Bad To The Bone: "I broke a thousand HEARTS, before I met you."
Steppenwolf - Born To Be Wild: "Take the world in a LOVE embrace."
Super Bomberman 3 (J): the best power-up is a detonator, whose icon is a HEART. And Pretty Bomber wears one, too!
Yuu Yuu Hakusho - Tokubetsu Hen (J): not a conventional fighting game, you select actions with a direction and a button and see the result play out in anime cinematics. You don't need to know anything about the original manga to enjoy this game. One character, Kurama, likes to use ROSES...
Nintendo 64
GoldenEye 007: everyone LOVES this shooter. It essentially gave birth to the most-LOVED genre today, the FPS. We LOVE this game, and that's enough to make it on this list.
Mario Tennis: if you don't score, your score is LOVE. Oh snap; obvious pun. But Peach's special moves also have lots of HEARTS.
Pokémon Puzzle League: last time we played Tetris Attack featuring Yoshi, this time it's the N64 version featuring the Pokémon. Match up blocks with colours and shapes, including HEARTS.
GameCube
DreamMix TV World Fighters (J): Optimus Prime Vs. Solid Snake Vs. Bomberman Vs. Simon Belmont! This is a Smash Bros. clone featuring Konami/Hudson/Takara characters, but instead of knocking people out, you steal their life energy in the form of big HEARTS.
The Legend Of Zelda: Four Swords Adventures: Link's life is represented by HEARTS. Hopefully we can have four GBAs again. Since we did Shadow Battle last time, maybe this time we'll do a few stages in the main adventure.
Pac-Man Vs.: this seemed to be a hit last time, so we're playing it again! It came PAIRED with Pac-Man World 2, it features the two most-LOVED game characters of all time (Pac-Man, plus Mario's voice), it was created by the PARTNERSHIP of Nintendo and Namco, and just to play it, it's necessary to COUPLE the GameCube and GBA together. Too much of a stretch? Just enjoy the game...
Wii
GoldenEye 007: the reimagining of the most-LOVED console first-person shooter is back.
Mortal Kombat Armageddon: all the Kombatants ever featured in a past Mortal Kombat are back. Now with Kreate-A-Fatility where you can do things like rip out the loser's HEART.
NBA Jam: "I LOVE this game!", so the NBA slogan goes. Boomshakalaka! Bangalangadoodah! Etc.