Iron Man

Tony stark aka iron man, has actually made quite a bit of appearances despite his debut being on the day of the major gacha war era. He fought the gacha kids with spiderman, darkseid, and thanos. They had to make a temporary retreat though during the war in order to buy time to save the 3 meggy's.
Then, during 04/05/2022 classic was playing soccer with the boys while koby watched but iron man had other ideas and decided to blast classic with a laser for some reason? Two days after that during the hunters hunt of the heroes, iron man and assic attempted to team up to take on the hunter (they died fast.)
As you can tell iron man mainly makes minor appearances but still notable ones. Like at 04/18/2022 where he was attacked by adolf hitler in a free for all fight. Tony didn't appear again until 07/26/2022 during the time that the hero's were taking over bases to help the war effort. The hunter found out and sent troops to deal with them. Tony said, "I bet mr clean can kill them all." When mr clean instead distracted the hunters troops with his ass tony responded, "okay, mr cleans on his own page." 
Stark was also present for the final battle at 08/01/2022 where he arrived to blast the hunters armies and assist the heroes in taking down the hunter plus the other leaders, once and for all. Hell, tony was even there for the battle against nukemaster where he worked with koby, classic, thor, and superman to blast nukemaster.
Its still evident that tony/iron man is a small character but he has still done some things and has helped the heroes quite a bit.