There are a lot of the 25th figures that I'd like to see totally redone in the more-detailed 30th style, but a lot of them were pretty decent, to be honest. We've gotten newer versions of guys like Duke, Flint, Beachhead, and Destro, and we'll no doubt keep getting more modern updates and redos, but there are some who either still need to be made, or need to be remade entirely because of how awful the first versions were.
For me, they've pretty much gotten passable "ARAH" modern versions of most of the Sunbow guys I want to see with the exception of:
Cross Country
Frostbite
Tollbooth
Keel-Haul (Not technically in Sunbow, but we need the USS Flagg's "driver" since it was a staple of the cartoon)
Law & Order
Big Lob
Ace (I know it's dumb, but I want one in that puffy Michelin-looking suit)
And these guys were bad Frankenjoes that sucked:
Iceberg (Club's sucks so far, but there's likely not a chance to see him any better at retail)
Thunder (ROC was tolerable)
Slipstream
Crankcase (25th one's Frankenjoe sucked)
Cutter (Same)
Monkeywrench
And while these were decent when they first came out in their 5-packs, they all need to be redone badly due to their importance in the line, in the same way that the 5-pack Trooper, SE, Baroness, Storm Shadow, and CC have been totally redone:
Duke
Scarlett
Roadblock
Gung Ho
Destro
Plus Leatherneck, Falcon, and General Hawk. Their 25th figures are so dated now, and to me, they seem like pretty prominent characters (or their figures weren't done well to begin with). God, do we need a good Leatherneck and Gung-Ho in proper Marine gear. Hopefully with similar uniforms, just with different load-outs. And there are some other late-80's and early 90's guys whose outfits or specialties weren't too ridiculous that I'd prefer to see too, like Repeater, Muskrat, Spearhead, etc, but I expect to see the Club do them. Guys like Recoil, Freefall, Colonel Courage, Heavy Duty, Arctic Stalker were pretty cool designs with a color edit or two, and maybe some updated gear.
As far as other figures, I'd love to see modern takes on old, silly characters like these guys:
Tripwire (modern EOD suit... The ARAH one sucks big time, just like the 25th redo)
Bazooka (maybe based off that ARAH "fisherman" design?)
Blowtorch
Mainframe
Tele-Viper
S.A.W.-Viper
...And any of the ARAH drivers and sub-teams like Battle Force 2000 who were kind of stupid. It'd be cool to get those as updated designs since I'm not tied to their vintage looks so much, but it's always cool to expand the modern Joe roster with old school characters.
Plus, new guys! There are some of the newer characters that weren't that bad, like Nightfox and White-Out, even though they were mostly FrankenJoes. Mouse isn't half bad, except for the blue and that stupid codename. New Cobra characters like Night Adder, Para-Viper, Bazooka Trooper, Shadow Tracker, Data-Viper, Zombie-Viper, Storm Rider, Shock Trooper are all decent-to-awesome additions. More like that, versus half-ass rehashes like Iron Grenadiers.