So I’m kinda new and trash at speedrunning and have only done like 3 Zelda botw runs and thought I wanted a bit of variety so I wanted to know which games would be easy to speedrun firstly or even more helpfully, tell me how difficult would it be to speedrun like a level or two in Splatoon 2 or Super Smash Bros. (Ultimate). Thanks for any replies! XP

You should probably ask the community of whatever game you want to run, this is a general forum and we won't be able to help you here.

Streets Of Rage 4 has many difficulty levels and has 17 characters. A new DLC is coming in a few days that will provide even more characters AND customisable movesets.

There are Individual Level leaderboards as well, so you could literally start with the easiest character (probably Cherry) and spam their best attack and get decent times on an individual level (some are as short as 2 minutes long!) and work your way up from there.