Quite a few of my characters know each other/know of each other due to them knowing mutual people. Anyway -
Katar Varo - Katar would try to kill just about any of my other characters except for Butler, who he would be best friends with. Before probably backstabbing. He also met Adeline though it was removed from her memory, but if he ran into her again he'd likely kidnap her as a "gift" for his girlfriend.
Butler - Butler has met Phillip Brosseau..he was his butler for quite a long time before beating him over the head with a bottle and leaving him in a closet before trying to cause a murder mystery and hold over twenty nobles captive. If he saw Phillip again as his Butler persona he'd likely run away, and if it was as his clown persona he'd go all out trying to murder him.
Philip - Phillip's relationship with Altior is quite icy, considering he slept with Al's wife, and also adopted his daughter after she was disowned and abandoned their family...As for Alexander, Phillip will soon be his father in law, though Phillip is protective of his daughter making it slightly awkward between them. If he met Daniel, it would likely remind him of his old self, and he would try to change him...likely as Daniel pulled his money off him. He would get along well with Kovic and hire him as a guard.
Daniel - With Daniel reacting as the above ^ to Phillip, he would likely make friends with Altior considering they're in similar lines of work, and he would also be friends with Adeline..likely a little more if it weren't for his wife Zen. If he ran into Katar or Butler, he'd try to set them on fire pretty quickly. The latter would explode due to the amount of chemicals he carried. Kovic and he would likely clash due to conflicting philosophies.
Altior - Altior would try to kill Adeline, Katar, or Butler...Adeline for manipulating his wife, Katar and Butler because of how they'd act towards him first. He'd have the above reaction to any other characters. He has a very strained relationship with Kovic due to Kovic beating the crap of Altior and locking him in a cell.
Kovic - Kovic would get along well with..almost none of my characters. He would end up in a bar fight with most of them.
Alexander - Alex wouldn't really pay much attention to the rest of the characters other than Phillip. If Altior ran into him, they'd likely catch up for a few minutes before him leaving due to awkwardness.
Adeline - Adeline would run if she saw Phillip since her plan isn't complete yet. If she saw Altior she'd also run because he knows who she is. If she saw Daniel she'd try to get in his pants..if she saw Butler she'd remember him and try to recruit him. If she saw Katar she wouldn't remember him but he would definitely remember her and that wouldn't go well at all.