A while back I put together a set of one-line summaries of the SotM heroes to let new folks pick their character without automatically going down the "who's your favorite hero?" route. It also highlights which one I recommend for novice players:
SEESOME’S SUMMARIES
One-line Guides to the Sentinels of the Multiverse Heroes
ABSOLUTE ZERO - Thermodynamic Hero. His cryo-suit keeps him alive & lets him manipulate cold and fire.
ARGENT ADEPT - A magical bard. His instruments can do almost anything when he has the right melodies.
BUNKER* - A military tank-suit. He builds up devastating weapon combos, but they can take time to deploy.
CAPTAIN COSMIC - Wielder of an alien crystal. He creates temporary energy constructs to aid his allies.
CHRONO-RANGER - A time-traveling old-west bounty-hunter. Six-guns or blasters, whatever does the job.
EXPATRIETTE* - An expert sharpshooter. She uses her guns, RPGs, & high-tech ammo instead of powers.
FANATIC* - An angelic warrior. She wields divine powers, which can damage her as well as her enemies.
GUISE - A metafictional goofball. He can take over the powers and equipment of other heroes.
HAKA* - An immortal brawler. His abilities can prevent damage, heal himself, & boost his attacks.
KNYFE* - A secret agent with energy blades. Her military & espionage training give her tactical advantages.
LEGACY* - A patriotic hero. He has flight & super-strength, but his greatest power is inspiring his team.
MISTER FIXER - A martial arts master and auto mechanic. He has a wide variety of improvised weapons.
NATURALIST - A shifter. He can become a gazelle, rhino, or crocodile; each with different abilities.
NIGHTMIST - Mistress of black magic. She dishes out lots of Infernal damage -- to herself as well as others
OMNITRON-X - A robot from the future. It can upgrade itself with various offensive & defensive mods.
PARSE - An archer who can sense hidden patterns. Her powers detect and exploit enemy weaknesses.
RA* - An archaeologist who wields the Staff of Ra. His firebolts deal large amounts of damage.
SCHOLAR - A mystic. He uses the Philosopher’s Stone to heal himself, alter his body, and redirect damage.
SETBACK - An unlucky hero. His risky behavior can turn misfortunes into boosts when his luck changes.
SKY-SCRAPER - A size-shifting alien. She can shrink & use gadgets to disrupt enemies or grow to bash them.
TACHYON* - A speedster. She starts weak, but her attacks get more powerful as her velocity increases.
TEMPEST* - An aquatic alien. M’kk uses weather-control powers to damage all enemies or aid teammates.
THE SENTINELS - A mini-team of four heroes. Weak individually, together they have a multitude of abilities.
THE WRAITH* - A dark vigilante. Her gadgets deal damage, shield herself, and control the battlefield.
UNITY - A technopath. She can turn scrap metal into robot golems with a wide variety of powers.
VISIONARY - A psychic. She can control environments and enemies, or just hit them with mental blasts.
* = Best choices for beginning players