Expy: Captain Britain was originally an expy of Captain America. This was deconstructed in Captain Britain and MI: 13 where Captain Britain says how much he admires Captain America and how he'd like to be a patriotic symbol just like Captain America, but there are a lot of things in the way. Later, he is resurrected by Merlin, who knits together a multitude of Union Jacks into a human body - making the Captain, like the flag he wears and the country he represents, a single being made of multiple parts; "One Thing That Contains Many".
Fisher King: Captain Britain has a magical connection with the British Isles.
My God, What Have I Done?: After the Stamford incident, courtesy of Civil War, Speedball became the grim&gritty hero Penace, blaming himself for the incident, and becoming a psychological trainwreck. Later though, he gets better to an extent, and this leads to...
The Atoner: He becomes Speedball again and joins the Avengers, as an instructor at Avengers Academy, trying to give the the students the proper guidance they need so that anything like Stamford won't happen again. He still has some issues to work through though. (Such as cutting himself.)
Meaningful Rename/That Man Is Dead: Speedball to Penance, but after he Finds Nitro, forces him to wear the Penance suit for his crimes and has him arrested he's back to Speedball.
Energy Absorption: Can absorb various forms of energy to boost his strength. He's even able to use this on living beings, allowing him to permanently rob gamma mutates of their powers. However, doing so runs the risk of burning him out, forcing him into Shape Shifter Mode Lock.
10-Minute Retirement: During the Time SkipSam gets Izzy and their child to leave Earth and takes their child to live in the Shi'ar Empire before Sunspot comes around to bring him back in the "Time Runs Out" arc.
Crimefighting with Cash: He actually buys out the services of A.I.M. minions during an undercover operation. During the Time Skip, he literally buys his way into A.I.M. and uses their services for good.
She's also the granddaughter of a Golden Age hero. Originally Dan Dare but it was in later printings of her origin issue and other stories that was Retcon to a Marvel Golden Age hero, Dan Kane, known as Captain Terror.
The Nth Doctor: Despite being the 5th named character, Izzy's origin shows that at any given time there are 1000s different 'subguardians' active at anytime working toward eventually taking over a 'Superguardian' title (such as Smasher) and join the main branch of the Imperial Guard.
Broken Hero: Both personalities, Tamara was in a car accident and was in a coma for a decade before Captain Universe took her body as her host. Captain Universe feels some is wrong with universe and a great disturbance coming from the Earth that warranted it/her taking on a full time host to confront the yet shown threat.
Cloud Cuckoo Lander: Due to Tamara's brain damage, any time she's at the wheel she just talks about pie.
Power Incontinence: His powers are connected to the "systems" of the Builders, and now that they're broken his powers aren't always working properly. Apparently if he leaves his home universe, his powers would stop working altogether.
Havok (Alexander "Alex" Summers)
Cain and Abel: While Scott is readying a mutant revolution, Alex has pretty much become the face of mutant/human relations by becoming the leader of his own team of Avengers.
Energy Absorption: Absorbs cosmic energy from the atmosphere and he can fire it at will.
Hand Blast: He tends to fire his energy blasts through his hands.
Jumped at the Call: After being informed that Captain Universe wanted him to join the team, Captain America asked if he had it in him to be an Avenger, he drew a line through the omega on his chest turning it into an A.
Evilutionary Biologist: Of the cosmic type, he and his sister Abyss have been traveling from world to world evolving species that they deemed worthy of evolution. But he's not evil, per se. Just misguided. Once Captain Universe tells him to stop destroying worlds, he agrees.
Eye Beams: Fires one from the third eye on his forehead.
Person of Mass Destruction: The Star Brand is one of the most powerful weapons in existence, and the White Events are designed to confer these powers on beings who are properly suited to use that power. This White Event went wrong, but Kevin seems to be doing fine with the power he's got. Usually.
Seers: Seems to have some type of precognitive ability.
Super Strength: Shown lifting a piece of a giant sentinel overhead with one arm.
Tangled Family Tree: She's technically one of Pym's artificial grandchildren, since he was the creator of the virus that spawned the diamond and her and the other five original AI. This also makes her and Dimitrios 'cousins' to Vision, Jocasta, and Victor.
Blue Marvel (Adam Brashear)
Antimatter: His powers were the result of an accident when he was working on a negative reactor which would harness anti-matter by creating a bridge between the negative zone and the positive matter universe.
Cool Old Guy: Though he looks like he's in his late 40's, he's actually around his mid to late 70's.
Healing Factor: Heals from being disembowled. He is fine a few pages later.
Second Super-Identity: Because of unknown circumstances he has to hide his true identity. First appearing to help Luke, Spider-Man, and Monica as the Spider-Hero, and later adopting the Ronin identity.
Turns out it was because he needed a costume to hide his identity. Otherwise the Deathwalkers would find out he was in the area and would catch onto him.