1 Dark Bowser and Dark Fawful - Bowser's Inside Story
2 Elder Princess Shroob - Partners In Time
3 Bowletta and Cackletta's Soul - Superstar Saga
Cackletta is not the original mario and luigi villain, have dark star core and fawful, but in the battle against cackletta with 1 HP, but, this mario boss is the 2ND easiest final boss of all time! you can heal yourself with healing items to survive, cackletta's attacks is too easy to dodge (like the weak ray with cackletta's eyes), and you need to beat both arms and head have small HP.
4 Dreamy Bowser - Dream Team
5 Giant Bowser - Dream Team
Giant Bowser. This boss fight is awesome! Apart from the gyroscope controls everything is really good!
6 Pill'odium - Dream Team
7 Elite Trio - Dream Team
8 Fawful (Second Fight) - Superstar Saga
9 Junker - Bowser's Inside Story
10 Shrooboid Brat - Partners In Time
11 Final Antasma - Dream Team
My favorite boss in any RPG.
12 The Koopalings - Superstar Saga
13 Rookie and Popple - Superstar Saga
14 Popple and Birdo - Superstar Saga
Hilarious, fun, and challenging. Definitely one of my favorite boss fights of all time. By the way, I've only played the first two mario and luigi games, but I will eventually play the others (heck I think I will start to play dream team tomorrow so if you think a fight from bowser's inside story, dream team, or paper jam is better, I will not contradict you, especially if its dark bowser/ dark fawful, that fight looks amazing.
15 Shrowser - Partners In Time
16 Jojora - Superstar Saga
Takes 1 damage each time, has 50 HP
17 Alpha Kretin - Bowser's Inside Story
This is the WORST boss of the game, because if the battlefield has Starlow instead of Luigi, then the battle would be cooler.
18 Scutlet - Bowser's Inside Story
19 Sunnycide - Partners In Time
20 Bowser - Bowser's Inside Story
Bowser is the main antagonist of the Mario Bros. Franchise. From kidnapping Princess Peach to simply destroying a fun game between Mario and Friends in the Mario Party spinoff series, this king of the Koopas has set up a certain hatred towards himself amongst the large cast of Mario Characters. He first ...read more.
21 Popple and Wiggler - Dream Team
22 Petey Piranha - Partners In Time
23 Fawful's Castle - Bowser's Inside Story
24 Fawful Express - Bowser's Inside Story
25 Big Massif - Dream Team
26 Mammoshka - Dream Team
27 Bowser and Antasma - Dream Team
28 Ice Midbus - Bowser's Inside Story
29 Midbus - Bowser's Inside Story
30 Mario-Bot and Luigi-Bot - Bowser's Inside Story
31 Bowser X - Bowser's Inside Story
32 Zeekeeper - Dream Team
33 Mama Piranha - Superstar Saga
34 Dark Star - Bowser's Inside Story
35 Bowser Jr. and Kamek - Partners In Time
36 Shroob Wiggler - Partners In Time
37 Fawful - Bowser's Inside Story
38 Big Massif's Disciples - Dream Team
39 Earthwake - Dream Team
40 Mount Pajamaja - Dream Team
41 Bowser Jr. - Dream Team
Bowser Jr., or sometimes simply Jr., is a video game character who appears in Nintendo's Mario franchise as the secondary antagonist. As his name implies, he is the son of the series' primary antagonist, Bowser.
42 Robo Drilldigger - Dream Team
43 Torkscrew - Dream Team
44 Kamek - Dream Team
45 King and Queen Whomp - Partners In Time
46 Shroobs - Bowser's Inside Story
47 Cackletta - Superstar Saga
48 Junker X - Bowser's Inside Story
49 Grobot - Dream Team
50 Piranha Bean - Superstar Saga