Hi. If this isn't acceptable I'll make a different character.
Could I perhaps be one of the kid's father? It could be very interesting to have a trustworthy adult as an Animorph. They wouldn't feel so alone in their struggle.
Edit: He could also explain how they got in a high security area.
Name: Ryan
Age: 52
Physical Features:
Height: 6 feet 4 inches
Weight: 203 pounds
Build: Muscular
Hair: Black with streaks of gray, standard army cut.
Eyes: Black/dark brown depending on the light.
Important features: A large slightly curved scar above his left eye, and a massive scar going from his left shoulder to his right waist.
3 Desired Morphs: Some form of bear, possibly a big cat(lion, tiger, etc), bird of prey(eagle, falcon, etc)
Personality: He is a somewhat moral person, but never lets that interfere with a mission He is a good friend to have, if you can gain his trust. That's the tricky part, since he isn't extremely trusting. He is a good father, and very supportive. He would be considered the cool/fun/trustworthy father that many kids want.
Bio:
He lived an unhappy childhood, being relentlessly mocked for his study of guns, swords, and combat. This was because he was a very small child, and they mocked his ambition of becoming a fighter. He didn't mind though. It made him strong. Strong of mind, and of body, from defending himself. He pushed himself to overcome every obstacle that was thrown in his path. He began learning martial arts and swordfighting at a young age, later learning about guns. His parents are dead, they died before he was born(Father) and during his birth(Mother). He has no family or friends that are noteworthy, though he has contacts, but they don't really count. He entered the mercenary business when he was 18 because it was what he knew best, not for revenge or some other motive. During his 10 years as a killer for hire, he developed many contacts in the shady underworlds of various places in which he carried out his missions. He also earned himself a reputation. He is an excellent hand to hand fighter, and also with swords. His accuracy with guns is also quite good, and he prefers pistols to rifles. He keeps a rifle anyway, as it can be useful. After around ten years of mercenary-ing, he turned his life around and joined the legitimate military. He rose through the ranks over the years, completing mission after mission. He stayed determined throughout it, and wound up becoming a highly decorated war hero and general. While he was on leave, he met a woman and got married. They lived together happily for 4 years before he was called back into service, just after their son turned 1. Their son was named Conner. Ryan was a good father when he wasn't out killing terrorists, and made sure to visit as often as possible. He was, due to his high rank, able to spend less time in the field and more time at home. He was always there for Conner and his friends if they needed help. Most people know his name and some 'legends' that he assures them are true, sometimes jokingly and sometimes not. At age 50, 2 years ago, he officially retired. He is wealthy from his military backpay.