I'm Mainly going to use the Hello Mario Engine for Game Maker Studio 1.4 to make my game, but here are some other engines I'm going to take from. by @Videogamejunkie443 (Matthew Alchtiwi)

Dking Engine Ver. 2 for Game Maker 7 – It has some good stuff, like the Shark Chomp from Yoshi’s Island.

Hello Engine 6 Fan-Made for Game Maker 8/8.1 – Has Wart, some Super Mario Land 2 bosses, and more enemies from Super Mario Bros. 2 USA/Doki Doki Panic.

Mario Worlds Delta for Game Maker Studio 1.4 – I’ll use this engine to add SMW enemies and correct ones that behave inaccurately.

Gatete Mario Engine 9 for Game Maker (Formerly known as Game Maker Studio 2) – This one has enemies from modern Mario games as well as classic, such as the Ant Trooper and Stingby, but what I really want from this engine is its powerups. Holy Toledo, this engine’s powerup game is strong.

Modern Sonic Engine for Game Maker 8.0/8.1– I’ll port Modern Sonic from this engine to the Hello Engine.

Sonic GMate Engine+ for Game Maker 8.0/8.1 - I’ll port Classic Sonic from this engine to the Hello Engine

Super Mega Engine for Game Maker Studio 1.4 - I’ll use the physics from this engine as a base for every other Mega Character (And Beck.)