Yay! I was waiting for this. XD Mine aren't as detailed as yours, but here goes nothing!
Spiridion- Bit shorter than average, but very skinny. I imagine him with shoulder-length hair, all different colors. XD Dark green eyes. Loves to show off, and is a bit of a jerk. Never misses an opportunity to strut his stuff. Ever. Is a bit of a punk, and always looks his best. In a relationship w/ Hattie. Extremely protective. A bit naive.
Stu- Just look up 2D from Gorillaz. XD Tall, skinny, scrawny, and a bit out of it. Spacey, and can seem a bit dumb at times. Blue hair, black eyes. A real sweetheart, though.
Norm- Very quiet. Average height, a bit pudgy. Short blackish red hair, dark brown eyes. Barely speaks. Very smart.
Hattie- Short, slender, model-like. Long, flowing strawberry-blonde hair, blue eyes. Doesn't care about what other people think. Very down-to-earth.
Damon and Waffle- Brothers, Waffle being the older of the two. Waffle has messy, black hair, blue eyes. Tall. He trusts his instincts and always makes sensible choices, while his brother, who is taller and extremely skinny, loves to take risks, but is a very hard worker nonetheless. Damon is loud, raucous, yet sensitive, and loves to show off, while Waffle is quiet.
Felix- The tallest of them all. XD Skinny. Shoulder-length blonde hair. Ice-blue eyes. Funny, loud, happy. The life of the party!
Lucifer- Mean, aggressive, know-it-all. Almost no friends. Average height. Short blonde hair. Never misses a chance to fight. Pessimistic.
Murdoc- Lol. Looks like Murdoc in Gorillaz and has the personality to match- mean, a jerk, aggressive, controlling. Loves to be the boss, and IS the boss. Loves to show off to the ladies. XD Is a bass guitarist!
Tallulah-Faye- Short, skinny. Spiky red shoulder-length hair, green eyes. A really sweet girl. Loves to party.
Marmaduke- Very tall. Shoulder-length purple hair. Black eyes. A sweet guy. Gets along with everyone. Sensitive, kind, gentle.
Nereus- Average height. Short black hair. Deep brown eyes. Tempermant just like Marmaduke's.
Maisie- Tall, slender. Short brown hair, light brown eyes. Preppy.
...As you can see, I don't feel like adding much detail right now. :P