This is important to know, gearbox or player. there are 25, now 26, but 25 is easier for math reasons, battleborn. For lore challenges that require, say that you kill ambra 25 times, you have to kill 1 of those 25 battleborn 25 times.
You cannot see what the other team picks for characters.
You have to hope that theey pick the one you need.
You have to then be better than them.
You need this to occur 25 times.
For ambra, you have a 1/25 chance of one player picking her, that chance becomes 5 in 25 because 5 battleborn on the other team must be chosen. theoretically, you have a 20% chance the other team will have the character you are trying to kill. Sounds pretty sweet number wise right? no. Battleborn are unlocked, so not everyone has Ambra. Additionally, the starter battleborn are played more because people who started by playing them stuck with those innitial characters, especially with characters like rath. Other characters are tiered. Galilea, even though she isn’t all that overpowered anymore, is played very often. Toby, who is basically a less mobile, larger version of marquis with no useful ultimate, is used much, much less. although tiers change with buffs and nerfs they do influence these situations. Then you have difficulty. Slightly different, this is how easy it is to play the character. Oscar mike and benedict are both pushers, but it you see more oscar mikes because (of the previous reasons and) his complexity. He is fairly simple. Grenade, shoot, stealth when health is low. Or stealth behind people, grenade, shoot. I mean, he can be more complicated to an extent, and he still takes skill to play, but he’s easier to understand and learn. Benedict has to manage the same damage with less health, slower projectiles, and a longer reload/ worsee dps, but, due to a mixture of helix upgrades, use of the z axis and well placed shots/his hawkeye, he can definitely come out on top over oscar mike. It’s simply a lot of players see him as not as good. Though sometimes, like with toby, this “complexity” is at the moment just not as good in as many situations as all other people who play like him, usually, this is different from tiers.
Finally, and probably the biggest point, is visuals. A lot of people I think don’t want to play an extremely pale, pointy chinned, tall toothpick or an icy, crystal giant maw, or a big grey guy with a rectangle on his chin when they could play the sleek caldarius, or the badass looking mushroom, or the soldier looking soldier. Thier appearance is fine, but it can be offputing, some people don’t think the character looks as interesting if they look bulky and without personality (both ambra and kelvin appearance wise don’t appear to have much of a personality, though I’m aware they actually do)
This extremely long explanation is why you aren’t getting ambra kills, or playing with kelvin or boldur as much as 20% of the time (for peopel on your team, it’s lower than 20% mathematically since there’s only 4 peoplee who can choose someone for you to play with, rather than 5), and instead getting a lot of the starter characters and cool guys like caldarius and powerful characters like ghalt. This is also why it’s frustrating for so many people. Don’t even get me started on some of the other ones, like Toby’s double kills.