Personality: Calm, innocent and coot, compassionate, will protect/save his friends at all costs
Bad traits: gets salty when people suggest he can't do something because of his health issue, gullible
Extra stuff: He has medically diagnosed POTs (Postural orthostatic tachycardia syndrome) so he gets dizzy and his heart rate increases when he stands up. This is why you'll normally see him sitting or laying down. (ah, just look it up! I suck at explaining... ;-;) He also has the soul of Bravery combined with a monster soul!
(don't ask why I gave a skeleton a condition that has something to do with your heart xD)
(art in thumbnail by @Bunnicorn100)