This is my first crack at a character speculation post. Thought I would start with an original X-Man. I feel like, on a scale of 10, Angel would be about a 3 when it comes to HP, so pretty squishy.
Yellow-Avian Agility (PASSIVE): Angel is simply too fast for the enemy to get a straight shot in. Black matches deal 50% less damage to him.
Level 2: 50% reduced damage from Green matches as well.
Level 3: Black matches deal 75% less damage.
Level 4: 75% reduced damage from Green and Blue matches as well.
Level 5: Black matches deal no damage to Angel.
Purple-Stand Back (8): Warren retreats into his curled wings and waits to catch the enemy by surprise. Stuns Angel for 3 turns after which he extends to full wingspan and deals 90 Damage to the target and stuns a random enemy for 1 turn.
Level 2: Stuns random enemy for 2 turns.
Level 3: Deals 120 damage.
Level 4: Stuns Angel for 2 turns.
Level 5: Stuns two random enemies for 2 turns.
Red-Up, Up, & Away (9): Angel takes the fight to the air, much to the disadvantage of his foe. Angel grabs the target and goes Airborne for 3 turns with them. He drops them to deal 115 damage to them.
Level 2: Deals 132 damage.
Level 3: Goes Airborne for 2 turns.
Level 4: Deals 157 damage.
Level 5: Goes Airborne for 1 turn.