For people writing paralyzed Charles, here's some research I have done on living with spinal paralysis:
(disclaimer, this is all from research, and I may have gotten things wrong)
So from reading, paralysis is painful, even total spinal separation (which, from the movies, he likely didn't have entirely for two reasons 1) we see him move his legs very minimally (could just be actor error but still) 2) he moved his legs a bit before the bullet was removed, leading to the idea that Erik actually paralyzed him, meaning that it's quite possible the bullet didn't go further into the spine).
Even total spinal cord separation often allows sensations of pain in the legs, just not responsive to touch. This pain is phantom/nerve pain caused by nerve misfires. Nerve pain is usually a burning/sharp and specific pain (think hitting your funny bone x1000).
Because you're unable to move your legs entirely, in the morning, people often experience intensely painful muscle spasms and are dependent on muscle relaxers to prevent the spasming/shaking in the legs. This is from disrupted nerve signals and can be worsened by lack of bloodflow or movement. Because of this sometimes people with paralysis will try to move their legs around manually with their arms to prevent the spasms.
Because of these spasms, people with these injuries often strap their legs into their chair. This strapping in also prevents the legs from falling out of the chair/leg holds, which can be dangerous if there is no response to touch.
Charles had a very low spinal injury, most likely somewhere in the L4-L5 vertebral. The nervous system is like an upside-down tree, it branches out but does not go up, so anything above the sight of the wound is left unaffected, meaning Charles would likely have full range of motion of his entire abdomen.
Due to the location of the injury he would likely be able to use the bathroom on his own, but would do it with something called 'bladder training'. He could likely still feel body signals to use the restroom (not present with higher injuries).
Many people with this kind of injury will cover their legs with a blanket or wear baggy clothes for two reasons. firstly, aforementioned muscle spasms (they are NO JOKE), but also because muscle atrophy will occur due to lack of use and may lead to an 'uneven' appearance of the body.
There are also mental health issues that often come from these injuries. The permanence and lack of independence is a huge piece, and people often struggle with depression and lack of identity after injury. It's also not uncommon to struggle with opioid addiction due to the severe pain.
Paralysis lowers the body's immune system and causes a depletion of 'reserves' so to speak. Those with these injuries are much more prone to illness or infection because their body is already under stress. It doesn't actually lower the immune system like HIV would, but the stress on the body puts them at more risk.
Some good sources to learn more:
This video shows a man demonstrating how he gets out of bed in the morning with a healed lower spinal injury, and gives great reference for what spasms look like. His whole channel is super educational
This video shows how to get from the floor into a wheel chair. Again, fantastic youtube channel, good reference for writing wheelchair transfers.
These memoirs are all fantastic and real life accounts of what it is like to live with these injuries.
Now go on and write disabled Charles, armed with knowledge <3
