Plotted and discussed with @hxroics, just posting some data about my Todoroki:
Name: Shojirou (”He who carries flame”)
The ‘older’ twin by scant minutes
Like Shouto, shares burn scars across the temple rather than fully around and on the eyes (from protecting one another from Rei)
Much more physically and vocally aggressive than Shouto, tends to leap down people’s throats and perceives bad intentions first rather than giving others the benefit of the doubt/defaulting fellow humans to ‘inherently kind/caring/good’
Physically near identical to Shouto, except their features are mirrored (hair and eye heterochromia are reversed)
Shares borderline unhealthy co-dependency with his twin since they managed to survive and endure thanks to each other, but he’s also more noticeably resistant to the concept of accepting that he and Shouto are allowed to have separate lives and interests
On a related note, sense of self and self-worth stems heavily from being his twin’s ever vigilant guardian/protector, so not feeling ‘needed’ anymore as they grow up and develop more differences bothers him deeply- He isn’t sure what he wants or who he really is apart from Shouto and wants that sort of dynamic back no matter what he might say to the contrary
Less forgiving in general, Shouto remains very attached and forgiving of Rei while Shojirou’s faith in all adults and authority figures pretty much evaporated and he strongly believes they can only ever trust or rely on each other from an emotional standpoint
Holds grudges like whoa, anger issues that need addressing/healthier ways of release, bark is just as bad as his bite