Okay, hint 22..?

Let's see. A silly arcade side scrolling shooter where you can pick up different weapons, with a narrator saying the name of the weapon with a very silly voice. The hobos you rescue also say "THANK YOU" in a silly way as well. Oh, you get to ride in awesome, and kind of cute-ish tanks. And you face off against soldiers and... ALIENS?!

#22: The main character, apart from being hated by many fans of the series, wasn't doing a real mission after all.

One of the Metal Slug games for sure. I know Metal Slug 3 has you facing aliens so Metal Slug 3. Final answer.

Metal Gear Solid 2: Sons of Liberty

Pin Pon! : D

#23 - You can shrink.

You are correct!

Minish Cap

Hint #23: This game originally released on a certain console in 2005, but later was released on the console's successor, which is the console I played on, along with the second game in this series in 2009.

Correct.