Leo Dooley

Leopold Francis "Leo" Dooley  (born May 7, 1999) is the main protagonist of Disney XD's 2012-2016 comedy television series Lab Rats. He was the only son and eldest child of Tasha Davenport, the older half-brother of Naomi Davenport, the stepson and second-youngest child of Donald Davenport, the step-brother/cousin of Adam, Bree, and Chase Davenport, the step-cousin of Daniel and Marcus Davenport  and step-nephew of Douglas Davenport. Loyal, caring and intelligent, Leo is initially an outcast until he meets his step-siblings, Adam, Bree and Chase and grows up. His stepfather, Donald had a lack of trust for Leo due to his tendency to accidentally destroy things, but has started to change his opinion, as he made Leo the team's "Mission Specialist."

Midway to Season 3, Leo becomes bionic after Douglas installs them to save his arm after it was crushed by a ceiling beam caused by Taylor when she blasted it on top of him and Donald put bionics in Leo's leg after it was crushed by a space elevator while saving his step-father.

Personality
Being a teenager in high school, Leo is still trying to find his place in it and in the world. At the beginning of the series, he was in still in his clumsy phase. However, Leo can be arrogant at times, though not as much as his stepfather, Donald.He is very close with his family and will do anything to protect them, as he went the distance to save the Lab Rats from dying in the future and his willingness to prove that Marcus and his father were evil and up to something. He could also be a rebellious teenager like he's mother Tasha was when she was younger and often disobeying his father Donald or his uncle Douglas.

In Season 3, Leo had begun maturing, and inventing things without breaking Donald's things, such as inventing orbs that he invented so they could protect Adam, Bree, and Chase from Douglas and Krane. Though the orbs went haywire, but Donald admitted Leo had a good concept going on. It is shown at this point, Leo was also willing to put the past behind himself and his enemies if they show change, as he did with Douglas in "Taken" and Taylor (S-1) in "One of Us." He willingly listened to what Douglas had to say about Victor Krane and agreed to a fresh start with Taylor, eventually becoming friends with both them.

Despite not having super intelligence, Leo was a smart teenager and was mentioned being the smart kid in school in the episode's premiere, mentioning it's not easy for him to Chase and the other Lab Rats. He is also quite intelligent, shown that he never liked Marcus even before it was revealed that Marcus was evil. Leo could also come up with plans for the missions, eventually becoming the team's strategic mission specialist. Like his brother Chase, Leo will sometimes remind people of the bigger picture, shown at least twice. The first time he reminded his siblings that they had to save Donald during the jet wing incident because he did the stupid stunt to give them the Lab back, causing Bree to realize their brother was right. Another time happened in "Which Father Knows Best?" where Leo told Douglas to get past his rivalry with his brother after Leo told him Donald couldn't fix Bree's chip when she broke it because Bree was more important. Additionally, Leo scolded his siblings for causing a blackout and fighting in "Rise of the Secret Soldiers." He also easily deduced that Douglas was behind cyberhacking Donald back when he was evil. Characters such as Douglas has said that Leo is a smart kid ever since the Marcus incident.

Ever since his mother married Donald, Leo remained supportive of her decision. After meeting his siblings, he wanted to become bionic like them, dropping hints to Donald. However, Douglas later gave Leo bionics to save his arm. The boy was excited but reckless with his bionics, something that caused Leo to connect Daniel with. Like his uncle and brother, Leo felt overshadowed by his older siblings, similar to how Chase felt when Adam and Bree are praised more than him in "Avalanche" and how Douglas felt with Donald all of his life. This is shown in "Lab Rats: On the Edge," where he expresses hope that his siblings don't see him as just their little brother. After saving Chase and taking charge, Donald realizes Leo is ready and levels him up to mentor, where Chase tells Leo he is proud of his little brother.

Bionic Powers
Semi-Bionic Physiology/Bionic Arm: After Leo's arm was crushed by a ceiling beam caused by Taylor when she was known as S-1, Douglas Davenport healed it with bionic components after learning his stepnephew would never be able to use his arm again. It have him secret abilities so Leo could have a defense skill.
 * Super Strength: Leo has strength in his arm similar to his stepbrother, Adam Davenport, being able to lift a couch with his one arm and punch through walls.
 * Laser Sphere Generation: Douglas gave Leo the ability to generate laser spheres in his hand. It is Leo's primary ability, and he uses it to knock out dangerous opponents, such as Victor Krane and Taylor (S-1)
 * EMP: Combined with Taylor's abilities, Leo and Taylor can create an EMP generation that can take out any electronic device of a high power. The first time they did it blew out the electricity on Bionic Island and when they did it a second time, Leo accidentally blinded Taylor and the third time, they successfully disabled the safety lock that was installed on the top of Donald's self-driving car.
 * Energy Absorption: Douglas unlocked this ability for Leo during the Battle of the Bionic Soldiers. It allows him to absorb energy from another source of power. He can also use it in Battle, as he used it to take out Taylor back when she was only S-1.

Glitches

 * Super Strength Unawareness: Though his super strength cannot glitch, Leo sometimes remains unaware that he is using his bionic strength or has it, lifting one of the couches in his living room when he was looking for his smart phone.
 * Bionic Sleepwalking: Because Leo's arm was not calibrated properly into his nervous system without a capsule, it caused Leo to sleep walk while using his laser sphere ability. However, Douglas gave Leo an arm capsule to stop this from happening.
 * Uncontrollable Laser spheres: Sometimes, Leo cannot have control of his laser spheres, as they set off uncontrollably when he is sleepwalking. They usually activate uncontrollably when Leo is excited (as he nearly set Douglas' hair on fire), panicking nearly burned Janelle alive, or irritated (by a fly, Leo's laser sphere blasted).

Trivia

 * Leo was the shortest member of the family, the only normal kid and the youngest (younger than even Chase).
 * He is now the second-tallest, a bionic teenager since the Season 3 Episode, "You Posted What?" and second-youngest since the discovery of his cousin, Daniel.
 * In the beginning of the series, Leo was thirteen years old. He turned fourteen in "Bionic Birthday Fail" and is sixteen by season 3 and the beginning of season 4. He is (presumably) seventeen by the series finale.
 * He was Tasha's only biological child until birth of her daughter and Leo's sister Naomi