So we're doing DLC wants? Alrighty:
1. Paper Mario - I'm biased, and I love the series
2. Octolings - People say they should be echos, but I argue that they should use the weapons that the Inklings DON'T use, such as the brellas, the chargers, splatlings, and dualies, and then have different subs, such as the mine, suction bomb, etc.
3. Maxwell from Scribblenauts - A completely off the walls choice, I know, but Scribblenauts is one of my favorite 3rd party games, and I love the idea of literally anything being part of a moveset. On that note
4. Steve - Yeah, I know, but Minecraft holds a special place in my heart. I was in middle school when it exploded in popularity, so I always had fun times going to tech club and playing Minecraft with my friends. Though I don't play much now, I will be the first to admit that I unironically want Steve.
5. Isaac - That ain't happening
And I would have prefered Shy Guy over the Plant if we're talking generic mooks, but I love the plant.