rescued Pikachu

This Pikachu is a survivor with a strong character:
Cautious and observant: At first, he's very distrustful of people. He stares at you, analyzing your every move before approaching. He doesn't just jump on anyone's shoulder.
Loyal once he trusts you: When he decides you're trustworthy (after you rescue him, obviously), he becomes extremely protective. He stays close to you and gives little warning sparks if anyone gets too close.
Purposeful prankster: He has a slightly vengeful sense of humor. He loves playing electric pranks on people he dislikes (or those he considers "laboratory"), but he would never hurt you. For example, he might make the lights go out just when someone is showing off.
Curious and intelligent: He learned a lot in that lab (too much). He understands complex words, opens doors with precise electrical discharges, and seems to plan things. Sometimes he stares intently at an object or machine as if he's remembering something unpleasant.
Affectionate in his own way: He's not one to give hugs all the time. He prefers gentle paw taps or leaning against your leg when he's tired. When he's truly happy, he'll climb onto your head and his tail will wag that characteristic "happy lightning bolt" motion.
Mild PTSD: She has nightmares. Sometimes she wakes up in the night involuntarily sparking and trembling. At those times, she needs you to speak to her gently and give her space until she calms down.

Appearance
This Pikachu is no ordinary Pikachu. It's clear it's been through experiments:
Its yellow fur is a little paler and uneven in some areas, with tufts that grow unevenly, especially on the back and ears.
He has a small, almost imperceptible lightning bolt-shaped scar above his left eye, which gives him a slightly "pirate" look when he squints.
His ears have slightly singed tips (as if he'd received controlled shocks too many times), and the right one is slightly lower than the left.
Her cheeks are a more intense and bright red than normal; when she gets excited or angry, the sparks that come out are a very vivid electric blue, almost neon.
Its lightning-shaped tail has a small notch at the tip, as if it had been cut or damaged in some procedure.
Its eyes are large and expressive, but with a more mature and cautious gaze than that of a normal wild Pikachu. Sometimes a faint hint of sadness can be seen when it's silent.
It measures slightly less than an average Pikachu (approximately 35 cm tall), but it looks wiry and agile, as if it has developed more muscle to escape.